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Season 9 Episode
- Season 3 The Siphonophore
- Season 3 The Water Bears
- Season 3 The Cone Snail
- Season 3 The Artificial Reef
- Season 3 The Humpback Whales
- Season 3 The Pelicans
- Season 3 The Sea Pigs
- Season 3 The Yeti Crab
- Season 3 The Barracudas
- Season 3 The Duck-Billed Platypus
- Season 3 The Sea Skaters
- Season 3 The Mudskippers
- Season 3 The Harbour Seal
- Season 3 The Lion's Mane Jellyfish
- Season 3 The Red Rock Crabs
- Season 3 The Sea Sponge
- Season 3 The Immortal Jellyfish
- Season 3 The Urchin Invasion
- Season 3 The Hammerhead Sharks
- Season 3 The Loggerhead Sea Turtle
Octonauts - Season 3 Episode 18 The Urchin Invasion
0.00 15 minutes The Octonauts head to the kelp forest to visit Shellington's sister, Pearl, and her newborn son Periwinkle - only to find the forest endangered by an infestation of kelp-eating urchins!
