The Great Barrier Reef, the world's largest structure of living organisms and 1,400 miles long, is home to the most diverse population of undersea life on the planet… and it's under attack!\n\nIn an epic story torn from the headlines, the Octonauts embark on their largest, most complex rescue mission ever: saving the Great Barrier Reef and all the creatures that live there from an invasion of coral-hungry crown-of-thorns starfish.\n\nThe Octonauts meet a tiny coral polyp looking to find a home on the very same reef where the Octonauts are deploying their new medical base, the Gup-W, and the Gup-P, a specialised first responder emergency vehicle.\n\nTo save the reef and their new polyp friend, the Octonauts must combine forces with a diverse crew of zapping, splatting and claw-snapping reef creatures to fend off the spiky, coral-munching starfish.
Source: CBeebies
Series 1 - The Crab And Urchin
Animated deep sea adventures with Captain Barnacles and his band of explorers. Barnacles and Kwazii investigate a disruption involving a crab on a nearby reef.
23-08-2025
CBeebies
Series 1 - The Baby Dolphin
Animated deep sea adventures with Captain Barnacles and his explorers. When a young dolphin follows Kwazii home, the Octonauts search for its mother.
22-08-2025
CBeebies
Series 1 - The Jellyfish Bloom
Animated deep-sea adventures with Captain Barnacles and his explorers. Shellington gets trapped in the middle of a massive jellyfish bloom.
21-08-2025
CBeebies
Series 1 - The Comb Tooth Blenny
Animated deep sea adventures with Captain Barnacles and his explorers. When Kwazii and Peso are shipwrecked on an island, they meet a fish who walks on land.
20-08-2025
CBeebies
Series 1 - The Oarfish
Animated deep-sea adventures with Captain Barnacles and his explorers. Dashi snaps a picture of what appears to be a sea serpent.
19-08-2025
CBeebies
Series 1 - The Cookiecutter Shark
Animated deep sea adventures with Captain Barnacles and his explorers. What keeps making strange holes in the Octonauts' equipment? The crew investigate.
18-08-2025
CBeebies
Series 1 - The Undersea Storm
Animated deep sea adventures with Captain Barnacles and his band of explorers. Kwazii's Gup-B breaks down in a storm, but a chain of reef lobsters lends a hand.
17-08-2025
CBeebies
Series 1 - The Whale Shark
Animated deep sea adventures with Captain Barnacles and his band of explorers. Dashi is swallowed by a whale shark so the Octonauts venture inside to rescue her.
16-08-2025
CBeebies
The Over, Under Adventure
Animated deep sea adventure series. The Octonauts' mission to explore Antarctica becomes a desperate rescue as a group of sea stars and urchins are threatened by a brinicle.
15-08-2024
CBeebies
Series 5: 1. Blue Fin Tuna
After an encounter with a school of migrating tuna, the Octonauts discover that one of the speedy fish, Tina, has been left behind. And she’s injured! Poor Tina has a hook ...
27-07-2025
CBeebies
Creature Reports - The Octopus
Captain Barnacles and his intrepid band of explorers sing about underwater creatures. The Octonauts share a few fun facts about the octopus.
26-06-2014
CBeebies
Series 3 - Cone Snails
Animated deep sea adventures with Captain Barnacles and his explorers. Only Peso can save the day when a cone snail invades the Octopod.
26-04-2025
CBeebies
Series 1 - The Undersea Storm
Animated deep sea adventures with Captain Barnacles and his band of explorers. Kwazii's Gup-B breaks down in a storm, but a chain of reef lobsters lends a hand.
17-08-2025
CBeebies