Splash takes his pals to go see his friend, LU, a fearless explorer in the deep. He has met Lu in his travels, and she has been an inspiration for Splash. Lu turns out to be a female football fish (the "Lu" stands for "bio-LU-minescent") who leads them on an adventure in the abyss. / Wave, the octopus, loves the musicality of Reeftown, but tries to keep others from discovering that he has no rhythm.

Splash sees a beautiful fish go by and instantly wants to be its friend, but whenever he tries to talk to the fish, it ignores him. He and his friends soon learn the fish has false eyespots on her back and had no idea they were trying to talk to her. / When Finny, a green dragonet, joins the group to play one day, Bubbles starts to worry that they're so similar, her friends won't need her around anymore.

Dunk meets Puffy, a female pufferfish who admires his sand patterns, and becomes friends with her. When he starts spending all his time with just Puffy and not with the group, the gang teaches Dunk that it's good to make new friends, but keep the old ones as well. / When Splash experiences his first earthquake on the reef, Bubbles and Dunk decide to go on a quest to find out what causes "the big shake" and help put their friend's mind at ease.

Dunk discovers that what he considers "just playing with sand" is actually considered beautiful art by his friends, and he is proud of himself for having a special talent. / Ripple leads the gang to investigate the legend of the Sea Dragon that has been passed down in her family. When they discover what Sea Dragons actually are, they learn that just because they haven't seen something before doesn't mean it doesn't exist.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

While playing in the kelp forest, Splash, Bubbles and Dunk meet Tidy the Garibaldi Fish, who is the self-appointed Kelp Forest Ranger. Tidy has been taking the kids' shells as they play in the forest, because he likes to keep everything clean and tidy. / Bubbles injures her fin and has trouble swimming, but still wants to move around, so she begins trying all of the methods that other creatures on the reef use to move.

While playing in the kelp forest, Splash, Bubbles and Dunk meet Tidy the Garibaldi Fish, who is the self-appointed Kelp Forest Ranger. Tidy has been taking the kids' shells as they play in the forest, because he likes to keep everything clean and tidy. / Bubbles injures her fin and has trouble swimming, but still wants to move around, so she begins trying all of the methods that other creatures on the reef use to move.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Dunk meets Puffy, a female pufferfish who admires his sand patterns, and becomes friends with her. When he starts spending all his time with just Puffy and not with the group, the gang teaches Dunk that it's good to make new friends, but keep the old ones as well. / When Splash experiences his first earthquake on the reef, Bubbles and Dunk decide to go on a quest to find out what causes "the big shake" and help put their friend's mind at ease.

Dunk meets Puffy, a female pufferfish who admires his sand patterns, and becomes friends with her. When he starts spending all his time with just Puffy and not with the group, the gang teaches Dunk that it's good to make new friends, but keep the old ones as well. / When Splash experiences his first earthquake on the reef, Bubbles and Dunk decide to go on a quest to find out what causes "the big shake" and help put their friend's mind at ease.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Chompy the Parrotfish decides she doesn't want to eat only algae anymore when she sees Splash and his friends eating a variety of things found in the water column (plankton, etc.) The others have to get Chompy back on her normal eating plan before the reef gets overrun with algae! / Bubbles and Ripple meet a jellyfish. However, when they bring Splash and Dunk to meet her, they discover she doesn't remember them at all. The kids learn that what they thought was one jellyfish were actually two identical clones of each other.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Splash and Bubbles have an argument and decide not to play together for a while. With the help of Dunk and Ripple, they learn how much better things go for each of them when they communicate and cooperate. Splash's friends think he is so good at hide and seek that they decide to challenge him to find sea creatures who can blend into the background, making them very hard to find.

Dunk discovers that what he considers "just playing with sand" is actually considered beautiful art by his friends, and he is proud of himself for having a special talent. / Ripple leads the gang to investigate the legend of the Sea Dragon that has been passed down in her family. When they discover what Sea Dragons actually are, they learn that just because they haven't seen something before doesn't mean it doesn't exist.

After a series of mishaps, Dunk becomes convinced that his lucky rock has become a bad luck charm. In order to bring back his good luck, Dunk is determined to get rid of the rock in the most permanent way possible: dropping it in the molten magma of the volcano located far down in the deep. / Maury, who's always "spreading the word" about things on the reef, often gets things wrong. Due to his poor vision, he sometimes mistakes what he thinks he sees, with comic results.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Gush's long-lost son Wart shows up in Reeftown to visit. Gush is excited to be a "hands-on" dad and take care of Wart, but Wart is extremely independent, and only wants to visit. Ultimately, Gush realizes that the Reeftown Rangers all look up to him as a father figure. / To show how much she appreciates everything he does for her and her brothers, Ripple wants to give her Papa time to relax, so she sets up a day full of special activities for him.

The kids find a tooth lying in the sand outside the reef, and they are determined to return it to the owner, even when they find out it's a shark! / Splash and his friends have a race around the reef, and Splash wins by riding the currents instead of swimming. Bubbles and Dunk then want to know all about the currents so they too can race faster.

The others are alarmed when they found out the reason Dunk is talking funny is that he has a parasite in his mouth. Dunk tells them that he doesn't want to get rid of the parasite and even thinks of it as a friend, but in truth, he is afraid to go see the cleaner shrimp. / Ripple hears a strange message traveling through the ocean and follows the voice all the way to a fin whale, who explains that the voice was a message from her brother thousands of miles away.

When a big storm passes over Reeftown, the friends experience rain and stormy conditions. They learn they don't need to be afraid, but it's good to stay close to home in a storm and take shelter. / The kids' old friend Scoot, a juvenile sea turtle, stops by the reef to see Splash and the gang. While there, he explains that he is getting older and wants to scout for some potential places to settle, so the kids show him everything that Reeftown has to offer!

While preparing for a reef obstacle course, the kids don't believe that Gush used to be very fast when he was young, because frogfish are so big and slow. However, Gush decides to run the obstacle course just to show them how fast a frogfish can be. / Dunk's "little cousin" Mo, a giant sunfish, comes to visit. The kids try to accommodate Mo, despite his large size, but he's only there for a short time, because large fish like him prefer the space in the open ocean.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

The others are alarmed when they found out the reason Dunk is talking funny is that he has a parasite in his mouth. Dunk tells them that he doesn't want to get rid of the parasite and even thinks of it as a friend, but in truth, he is afraid to go see the cleaner shrimp. / Ripple hears a strange message traveling through the ocean and follows the voice all the way to a fin whale, who explains that the voice was a message from her brother thousands of miles away.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

The others are alarmed when they found out the reason Dunk is talking funny is that he has a parasite in his mouth. Dunk tells them that he doesn't want to get rid of the parasite and even thinks of it as a friend, but in truth, he is afraid to go see the cleaner shrimp. / Ripple hears a strange message traveling through the ocean and follows the voice all the way to a fin whale, who explains that the voice was a message from her brother thousands of miles away.

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Tired of always being the "nervous friend," Dunk decides he will no longer puff up or get upset. At first, Splash, Bubbles and Ripple are happy that Dunk won't be nervous, but soon realize that Dunk's cautiousness and puffing up serves a great function in their relationship. / Splash, Dunk and Bubbles spend the day with Tidy, the Garibaldi Fish, as "kelp forest keepers." Tidy's desire to have everything "just so" conflicts with Bubbles, Dunk and Splash's desire to have fun exploring the kelp forest.

Tired of always being the "nervous friend," Dunk decides he will no longer puff up or get upset. At first, Splash, Bubbles and Ripple are happy that Dunk won't be nervous, but soon realize that Dunk's cautiousness and puffing up serves a great function in their relationship. / Splash, Dunk and Bubbles spend the day with Tidy, the Garibaldi Fish, as "kelp forest keepers." Tidy's desire to have everything "just so" conflicts with Bubbles, Dunk and Splash's desire to have fun exploring the kelp forest.

Zee the Zebra Bullhead Shark feels a bit threatened in her shark identity when news of an impressive great white shark in the area spreads to the reef, and everyone wants to go see it. / Dunk has spent a long time on his latest beautiful art project and asks Splash, Bubbles, and Ripple to watch over it, which they promise to do. When the tide comes in, they try their best to protect it, only to learn Dunk knew that would happen eventually anyway.

Splash's old school comes to visit the reef. Splash and his friends are impressed by their synchronized swimming abilities and try to duplicate them, but their attempt is complicated by the fact that they all move differently. / After losing Dunk's lucky shell in the abyss without any light to guide them, Splash and friends follow a mysterious light in the distance before realizing that the light is from a firefly squid.

Splash, Dunk and Bubbles try to help a fish that they've never seen before find out who it is and where its home is. / When Splash joins Bubbles, Dunk, and Ripple for a sleepover in the Sandy Bed, they discover that Splash doesn't sleep much; after unsuccessfully trying to help him, they learn that "schooling fish" don't need as much sleep.

Zee the Zebra Bullhead Shark feels a bit threatened in her shark identity when news of an impressive great white shark in the area spreads to the reef, and everyone wants to go see it. / Dunk has spent a long time on his latest beautiful art project and asks Splash, Bubbles, and Ripple to watch over it, which they promise to do. When the tide comes in, they try their best to protect it, only to learn Dunk knew that would happen eventually anyway.

Tired of always being the "nervous friend," Dunk decides he will no longer puff up or get upset. At first, Splash, Bubbles and Ripple are happy that Dunk won't be nervous, but soon realize that Dunk's cautiousness and puffing up serves a great function in their relationship. / Splash, Dunk and Bubbles spend the day with Tidy, the Garibaldi Fish, as "kelp forest keepers." Tidy's desire to have everything "just so" conflicts with Bubbles, Dunk and Splash's desire to have fun exploring the kelp forest.

While playing, Splash senses something is wrong and quickly swims out of Dunk's way as he comes in for a hard landing. The strange thing is that Splash wasn't even looking in Dunk's direction, so how did he know he was coming? Convinced that he has some sort of superpower, the kids begin testing Splash's limits in a series of sneak attacks, which never work. Gush soon explains that Splash isn't a superhero, but simply has a lateral line sense, which is common for fish. / Ripple feels like she is struggling to be part of her group of friends, then meets a shy oyster named Pearlene, who also feels isolated from those around her. Seeing how nice and kind Pearlene truly is, Ripple encourages her to "open up" to others and make new friends. She does, and finds that, despite her rocky, mucky exterior, she has a great inner beauty: not just the pearl inside of her shell, but also her warmth and compassion for everyone.

Splash's old school comes to visit the reef. Splash and his friends are impressed by their synchronized swimming abilities and try to duplicate them, but their attempt is complicated by the fact that they all move differently. / After losing Dunk's lucky shell in the abyss without any light to guide them, Splash and friends follow a mysterious light in the distance before realizing that the light is from a firefly squid.

Still traveling with Scoot and looking for Flo's home beach, Splash recalls hearing about a beautiful reef nearby - perhaps that's where Flo's home is. They're all surprised when the once lush reef turns out to have become a ghost reef. Splash and friends, as Reeftown Rangers, stay to help the one remaining Parrotfish save the reef, realizing that if harm can come to this reef, it can happen to any reef, including Reeftown. / Splash and his friends end their journey, returning home to Reeftown, where they are delighted to see that Splash now knows that although there are fun adventures to be found all over their "One Big Ocean," Reeftown is home to him.

While playing, Splash senses something is wrong and quickly swims out of Dunk's way as he comes in for a hard landing. The strange thing is that Splash wasn't even looking in Dunk's direction, so how did he know he was coming? Convinced that he has some sort of superpower, the kids begin testing Splash's limits in a series of sneak attacks, which never work. Gush soon explains that Splash isn't a superhero, but simply has a lateral line sense, which is common for fish. / Ripple feels like she is struggling to be part of her group of friends, then meets a shy oyster named Pearlene, who also feels isolated from those around her. Seeing how nice and kind Pearlene truly is, Ripple encourages her to "open up" to others and make new friends. She does, and finds that, despite her rocky, mucky exterior, she has a great inner beauty: not just the pearl inside of her shell, but also her warmth and compassion for everyone.

When Splash and Bubbles hear that one of Ripple's Brothers has wandered off, they join Ripple's search, while enlisting the help of Zee and her new friend, Hamilton the hammerhead shark, to find him. / Maury discovers Denny's molted exoskeleton in the reef and assumes something must be wrong with "the real Denny," so he enlists the help of Splash and friends to find her, only to discover that she has simply molted.

Splash, Dunk and Bubbles try to help a fish that they've never seen before find out who it is and where its home is. / When Splash joins Bubbles, Dunk, and Ripple for a sleepover in the Sandy Bed, they discover that Splash doesn't sleep much; after unsuccessfully trying to help him, they learn that "schooling fish" don't need as much sleep.

Mayor Sting has to attend a stingray migration, which will take him away from the reef. Dunk volunteers to fill in as the mayor for the day, thinking it will be an easy job, but has no idea what it takes to keep the reef thriving and safe. / When Bubbles goes looking for the ultimate mud puddle, she ventures down to the Deep, where Lu takes them to see a hydrothermal vent and meet some lipstick tubeworms and Oblo the blobfish.

After putting some Asterina starfish in the Kelp Forest where they don't belong, Splash, Ripple, and Tidy must get rid of them before the starfish eat all of the kelp. / Dunk, Bubbles, and Ripple don't believe Splash when he tells them about a mountain that spits out fire that can be found in the water really far down in the deep. To solve this mystery, the kids find Lu, who takes them into the deep to find a submarine volcano.

After the kids hunt for treasure and compare what they've found, Flo explains that she knows the location of a wonderful treasure that came from above the surface. Since the kids want to find it, Flo sets them out on a mysterious journey and if they follow her directions, the treasure will be waiting for them. / Bubbles, feeling self-conscious about a healing blemish on her face, meets Myshell, a friendly, outgoing decorator crab who has covered her shell with all kinds of shells, coral and sponges. Myshell teaches Bubbles how to feel good about herself from the inside out.

When Splash invites Ripple, Bubbles and Dunk on a Reeftown Rangers exploration adventure, the friends worry that Splash will find another home out there in the big ocean and move on from Reeftown. / Splash and his friends meet Scoot, a young sea turtle who is riding the currents. As Reeftown Rangers, the group wants to help the mischievous turtle on his journey and see some new places along the way!

After visiting a spooky cave, Splash and his friends visit the spookiest place they know, the cave of the old hagfish, who lives deep in the abyss. / Dunk gets spooked by a creature in his home and thinks it's a monster, only to discover a Baby Sea Urchin who is hiding from a giant "Thing" that circles in the waters above the reef - Mayor Sting!

Still traveling with Scoot and looking for Flo's home beach, Splash recalls hearing about a beautiful reef nearby - perhaps that's where Flo's home is. They're all surprised when the once lush reef turns out to have become a ghost reef. Splash and friends, as Reeftown Rangers, stay to help the one remaining Parrotfish save the reef, realizing that if harm can come to this reef, it can happen to any reef, including Reeftown. / Splash and his friends end their journey, returning home to Reeftown, where they are delighted to see that Splash now knows that although there are fun adventures to be found all over their "One Big Ocean," Reeftown is home to him.

Splash, Dunk and Bubbles try to help a fish that they've never seen before find out who it is and where its home is. / When Splash joins Bubbles, Dunk, and Ripple for a sleepover in the Sandy Bed, they discover that Splash doesn't sleep much; after unsuccessfully trying to help him, they learn that "schooling fish" don't need as much sleep.

When Splash and Bubbles hear that one of Ripple's Brothers has wandered off, they join Ripple's search, while enlisting the help of Zee and her new friend, Hamilton the hammerhead shark, to find him. / Maury discovers Denny's molted exoskeleton in the reef and assumes something must be wrong with "the real Denny," so he enlists the help of Splash and friends to find her, only to discover that she has simply molted.

When Splash invites Ripple, Bubbles and Dunk on a Reeftown Rangers exploration adventure, the friends worry that Splash will find another home out there in the big ocean and move on from Reeftown. / Splash and his friends meet Scoot, a young sea turtle who is riding the currents. As Reeftown Rangers, the group wants to help the mischievous turtle on his journey and see some new places along the way!

Splash and Bubbles have an argument and decide not to play together for a while. With the help of Dunk and Ripple, they learn how much better things go for each of them when they communicate and cooperate. Splash's friends think he is so good at hide and seek that they decide to challenge him to find sea creatures who can blend into the background, making them very hard to find.

After the kids hunt for treasure and compare what they've found, Flo explains that she knows the location of a wonderful treasure that came from above the surface. Since the kids want to find it, Flo sets them out on a mysterious journey and if they follow her directions, the treasure will be waiting for them. / Bubbles, feeling self-conscious about a healing blemish on her face, meets Myshell, a friendly, outgoing decorator crab who has covered her shell with all kinds of shells, coral and sponges. Myshell teaches Bubbles how to feel good about herself from the inside out.

After a series of mishaps, Dunk becomes convinced that his lucky rock has become a bad luck charm. In order to bring back his good luck, Dunk is determined to get rid of the rock in the most permanent way possible: dropping it in the molten magma of the volcano located far down in the deep. / Maury, who's always "spreading the word" about things on the reef, often gets things wrong. Due to his poor vision, he sometimes mistakes what he thinks he sees, with comic results.

When Splash and Bubbles hear that one of Ripple's Brothers has wandered off, they join Ripple's search, while enlisting the help of Zee and her new friend, Hamilton the hammerhead shark, to find him. / Maury discovers Denny's molted exoskeleton in the reef and assumes something must be wrong with "the real Denny," so he enlists the help of Splash and friends to find her, only to discover that she has simply molted.

When Splash and his friends are playing at the sandy bed, they find a parrotfish munching on some coral and helping to create the sandy bed on which they're playing, because parrotfish produce sand from their bodies after they eat. / When Bubbles gets trapped in a treasure chest, Splash and his friends can't get her out. Luckily she's not alone when they discover Wave in there, who they think is also stuck until he show that being an invertebrate means he can squeeze even tiny spaces.

When Splash and his friends are playing "surprise fish," they accidentally release a "fear smell alarm," which spreads from fish to fish and causes Mayor Sting to call for everyone to be "reef ready!" / The Reeftown Rangers help Dorsal locate his old friend Spin, another spinner dolphin who he hasn't seen since he was young. They recognize each other with their unique whistle names and are happy to be reunited after many years.

Mayor Sting has to attend a stingray migration, which will take him away from the reef. Dunk volunteers to fill in as the mayor for the day, thinking it will be an easy job, but has no idea what it takes to keep the reef thriving and safe. / When Bubbles goes looking for the ultimate mud puddle, she ventures down to the Deep, where Lu takes them to see a hydrothermal vent and meet some lipstick tubeworms and Oblo the blobfish.

Splash and friends are playing in their clubhouse when Jerome and the fusiliers show up, claiming that the ship is actually their clubhouse. The two groups must then figure out who can use the clubhouse once and for all. / Being the newest member of Reeftown, Splash discovers the majority of things around him on the reef are actually living creatures. Some corals, some spongy things, some creatures he had no idea about, but no matter what their size, color or shape, he finds out that each have their own unique voice to be heard!

Chompy the Parrotfish decides she doesn't want to eat only algae anymore when she sees Splash and his friends eating a variety of things found in the water column (plankton, etc.) The others have to get Chompy back on her normal eating plan before the reef gets overrun with algae! / Bubbles and Ripple meet a jellyfish. However, when they bring Splash and Dunk to meet her, they discover she doesn't remember them at all. The kids learn that what they thought was one jellyfish were actually two identical clones of each other.

When Splash and his friends are playing at the sandy bed, they find a parrotfish munching on some coral and helping to create the sandy bed on which they're playing, because parrotfish produce sand from their bodies after they eat. / When Bubbles gets trapped in a treasure chest, Splash and his friends can't get her out. Luckily she's not alone when they discover Wave in there, who they think is also stuck until he show that being an invertebrate means he can squeeze even tiny spaces.

Bubbles learns that every drop of ocean water is full of life, and decides to take in a nanoplankton friend who is invisible to everyone, including her. / Tidy meticulously cleans up the kelp forest in anticipation of the arrival of his new partner, a female garibaldi fish named Neat. Splash and his friends, however, get Mrs. Tidy mixed up with another fish, who's not an easy fit in the kelp forest. When the real Mrs. Tidy (Neat) arrives, she is very impressed with Tidy's clean algae bed, and appreciates the kelp forest.

Chompy the Parrotfish decides she doesn't want to eat only algae anymore when she sees Splash and his friends eating a variety of things found in the water column (plankton, etc.) The others have to get Chompy back on her normal eating plan before the reef gets overrun with algae! / Bubbles and Ripple meet a jellyfish. However, when they bring Splash and Dunk to meet her, they discover she doesn't remember them at all. The kids learn that what they thought was one jellyfish were actually two identical clones of each other.

When a big storm passes over Reeftown, the friends experience rain and stormy conditions. They learn they don't need to be afraid, but it's good to stay close to home in a storm and take shelter. / The kids' old friend Scoot, a juvenile sea turtle, stops by the reef to see Splash and the gang. While there, he explains that he is getting older and wants to scout for some potential places to settle, so the kids show him everything that Reeftown has to offer!

Splash takes his pals to go see his friend, LU, a fearless explorer in the deep. He has met Lu in his travels, and she has been an inspiration for Splash. Lu turns out to be a female football fish (the "Lu" stands for "bio-LU-minescent") who leads them on an adventure in the abyss. / Wave, the octopus, loves the musicality of Reeftown, but tries to keep others from discovering that he has no rhythm.

Splash and Bubbles have an argument and decide not to play together for a while. With the help of Dunk and Ripple, they learn how much better things go for each of them when they communicate and cooperate. Splash's friends think he is so good at hide and seek that they decide to challenge him to find sea creatures who can blend into the background, making them very hard to find.

Splash sees a beautiful fish go by and instantly wants to be its friend, but whenever he tries to talk to the fish, it ignores him. He and his friends soon learn the fish has false eyespots on her back and had no idea they were trying to talk to her. / When Finny, a green dragonet, joins the group to play one day, Bubbles starts to worry that they're so similar, her friends won't need her around anymore.

Bubbles learns that every drop of ocean water is full of life, and decides to take in a nanoplankton friend who is invisible to everyone, including her. / Tidy meticulously cleans up the kelp forest in anticipation of the arrival of his new partner, a female garibaldi fish named Neat. Splash and his friends, however, get Mrs. Tidy mixed up with another fish, who's not an easy fit in the kelp forest. When the real Mrs. Tidy (Neat) arrives, she is very impressed with Tidy's clean algae bed, and appreciates the kelp forest.

Dunk discovers that what he considers "just playing with sand" is actually considered beautiful art by his friends, and he is proud of himself for having a special talent. / Ripple leads the gang to investigate the legend of the Sea Dragon that has been passed down in her family. When they discover what Sea Dragons actually are, they learn that just because they haven't seen something before doesn't mean it doesn't exist.

After a series of mishaps, Dunk becomes convinced that his lucky rock has become a bad luck charm. In order to bring back his good luck, Dunk is determined to get rid of the rock in the most permanent way possible: dropping it in the molten magma of the volcano located far down in the deep. / Maury, who's always "spreading the word" about things on the reef, often gets things wrong. Due to his poor vision, he sometimes mistakes what he thinks he sees, with comic results.

When a big storm passes over Reeftown, the friends experience rain and stormy conditions. They learn they don't need to be afraid, but it's good to stay close to home in a storm and take shelter. / The kids' old friend Scoot, a juvenile sea turtle, stops by the reef to see Splash and the gang. While there, he explains that he is getting older and wants to scout for some potential places to settle, so the kids show him everything that Reeftown has to offer!

Gush's long-lost son Wart shows up in Reeftown to visit. Gush is excited to be a "hands-on" dad and take care of Wart, but Wart is extremely independent, and only wants to visit. Ultimately, Gush realizes that the Reeftown Rangers all look up to him as a father figure. / To show how much she appreciates everything he does for her and her brothers, Ripple wants to give her Papa time to relax, so she sets up a day full of special activities for him.

After a series of mishaps, Dunk becomes convinced that his lucky rock has become a bad luck charm. In order to bring back his good luck, Dunk is determined to get rid of the rock in the most permanent way possible: dropping it in the molten magma of the volcano located far down in the deep. / Maury, who's always "spreading the word" about things on the reef, often gets things wrong. Due to his poor vision, he sometimes mistakes what he thinks he sees, with comic results.

The kids find a tooth lying in the sand outside the reef, and they are determined to return it to the owner, even when they find out it's a shark! / Splash and his friends have a race around the reef, and Splash wins by riding the currents instead of swimming. Bubbles and Dunk then want to know all about the currents so they too can race faster.

Gush's long-lost son Wart shows up in Reeftown to visit. Gush is excited to be a "hands-on" dad and take care of Wart, but Wart is extremely independent, and only wants to visit. Ultimately, Gush realizes that the Reeftown Rangers all look up to him as a father figure. / To show how much she appreciates everything he does for her and her brothers, Ripple wants to give her Papa time to relax, so she sets up a day full of special activities for him.

The others are alarmed when they found out the reason Dunk is talking funny is that he has a parasite in his mouth. Dunk tells them that he doesn't want to get rid of the parasite and even thinks of it as a friend, but in truth, he is afraid to go see the cleaner shrimp. / Ripple hears a strange message traveling through the ocean and follows the voice all the way to a fin whale, who explains that the voice was a message from her brother thousands of miles away.

When Splash and his friends are playing "surprise fish," they accidentally release a "fear smell alarm," which spreads from fish to fish and causes Mayor Sting to call for everyone to be "reef ready!" / The Reeftown Rangers help Dorsal locate his old friend Spin, another spinner dolphin who he hasn't seen since he was young. They recognize each other with their unique whistle names and are happy to be reunited after many years.

Tired of always being the "nervous friend," Dunk decides he will no longer puff up or get upset. At first, Splash, Bubbles and Ripple are happy that Dunk won't be nervous, but soon realize that Dunk's cautiousness and puffing up serves a great function in their relationship. / Splash, Dunk and Bubbles spend the day with Tidy, the Garibaldi Fish, as "kelp forest keepers." Tidy's desire to have everything "just so" conflicts with Bubbles, Dunk and Splash's desire to have fun exploring the kelp forest.

Splash and friends are playing in their clubhouse when Jerome and the fusiliers show up, claiming that the ship is actually their clubhouse. The two groups must then figure out who can use the clubhouse once and for all. / Being the newest member of Reeftown, Splash discovers the majority of things around him on the reef are actually living creatures. Some corals, some spongy things, some creatures he had no idea about, but no matter what their size, color or shape, he finds out that each have their own unique voice to be heard!

Zee the Zebra Bullhead Shark feels a bit threatened in her shark identity when news of an impressive great white shark in the area spreads to the reef, and everyone wants to go see it. / Dunk has spent a long time on his latest beautiful art project and asks Splash, Bubbles, and Ripple to watch over it, which they promise to do. When the tide comes in, they try their best to protect it, only to learn Dunk knew that would happen eventually anyway.

Splash takes his pals to go see his friend, LU, a fearless explorer in the deep. He has met Lu in his travels, and she has been an inspiration for Splash. Lu turns out to be a female football fish (the "Lu" stands for "bio-LU-minescent") who leads them on an adventure in the abyss. / Wave, the octopus, loves the musicality of Reeftown, but tries to keep others from discovering that he has no rhythm.

Splash, Dunk and Bubbles try to help a fish that they've never seen before find out who it is and where its home is. / When Splash joins Bubbles, Dunk, and Ripple for a sleepover in the Sandy Bed, they discover that Splash doesn't sleep much; after unsuccessfully trying to help him, they learn that "schooling fish" don't need as much sleep.