Season 4

01 Octonauts and the Poison Dart Frogs Episode 123rd September 2015 When a giant wave hurls Amazon River creatures up into the trees, the Octonauts must get them down safely, without disturbing poison dart frogs who live there. 02 Octonauts and the Hidden Lake Episode 224th September 2015 The Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice. 03 Octonauts and the Octopod Mystery Episode 325th September 2015 When the Octopod breaks down, Tweak and the crew search for a missing part aboard an abandoned prototype of the ship, not realising something lives there. 04 Octonauts and the Baby Sea Turtles Episode 428th September 2015 As newborn baby sea turtles make their way to the ocean, the Octonauts must steer them clear a giant wave and hungry predators. 05 Octonauts and the Walrus Pups Episode 529th September 2015 Captain Barnacles and his niece and nephew, Ursa and Orson, must rescue walrus pups who are stranded on a runaway ice floe, before it collides with a huge iceberg! 06 Octonauts and the Mantis Shrimp Episode 630th September 2015 The Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod. 07 Octonauts and the Loneliest Whale Episode 71st October 2015 The Octonauts follow a strange song to a lonely humpback whale. 08 Octonauts and the Tree Lobsters Episode 82nd October 2015 When a storm washes Peso onto a mysterious, rocky island, he meets a band of lobster-like insects thought to be extinct. 09 Octonauts and the Convict Fish Episode 914th December 2015 The Octonauts evacuate the creatures living around a reef before a large archway collapses, but one stubborn convict fish refuses to move from her burrow. 10 Octonauts and the Emperor Penguins Episode 1016th December 2015 The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family. 11 Octonauts and the Crawfish Episode 113rd December 2016 When a population of crawfish is stricken by illness, the Octonauts race to find a cure. 12 Octonauts and the Flamingos Episode 124th December 2016 The Octonauts find a lost flamingo chick separated from his family and they have to return him there before hungry alligators do! 13 Octonauts and the Tiger Shark Episode 1327th May 2017 When a hungry tiger shark eats the camera that Tweak's turtle friend Sandy gets in the Octopod, she and the Octonauts must rescue her before it eats everything in its path. 14 Octonauts and the Sunfish Episode 1428th May 2017 When a huge sunfish enters the GUP-E, Peso and Kwazii must somehow get the large fish out of the Gup. Eventually they find out it's a Sunfish a fish with no fins. 15 Octonauts and the Coelacanth Episode 1529th May 2017 While exploring a dark and spooky cave, The Octonauts find a strange fossil of a powerful prehistoric fish... but it may be more than just a fossil! 16 Octonauts and the Surfing Snails Episode 166th September 2017 When surfing snails are swept out to sea, it's up to Dashi and the Octonauts to save them. 17 Octonauts and the Yellow Bellied Sea Snakes Episode 1713th September 2017 When Peso gets stranded on a beach with a mass of poisonous snakes after a terrible storm, he and the Octonauts must somehow get them back to the ocean. 18 Octonauts and the Hippos Episode 1820th September 2017 Trying to return home from a mission along an African river, the Octonauts have trouble getting past a gang of large, mud-splatting, territorial hippos. 19 Octonauts and Operation Cooperation Episode 1927th September 2017 After Shellington crashes the GUP-D for the 3rd time, he and Kwazii team up with moray eels and grouper fish to help pick up the pieces and fix the vehicle before daylight occurs. 20 Octonauts and the Bomber Worms Episode 2023rd October 2017 While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms. 21 Octonauts and the Kelp Monster Mystery Episode 2124th October 2017 Dashi teams up with her little sister Koshi to help the Octonauts solve a mysterious disappearance in the Kelp Forest. This is the second episode in which is unknown who sounded the Octo-Alert. 22 Octonauts and the Coconut Crisis Episode 2225th October 2017 Kwazii takes a vacation on Coconut Island where he gets hit by some coconuts. Then he and the Octonauts must help their old friends the Coconut Crabs discover who's stealing all their coconuts. 23 Octonauts and the Baby Gator Episode 2326th October 2017 Kwazii adopts a baby alligator naming him Nipper, but when it escapes the Octopod, he and the Octonauts must rescue him. 24 Octonauts and the Spinner Dolphins Episode 2427th October 2017 The Octonauts struggle to save a pod of spinner dolphins who seem to be just swimming in their sleep.