Octonauts
Follows an underwater exploring crew made up of stylized anthropomorphic animals, a team of eight adventurers who live in an undersea base, the Octopod, from where they go on undersea adventures with the help of a fleet of aquatic vehicles.

Season 4 · Episode 21 ·
Octonauts and the Kelp Monster Mystery
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.
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Episode 21 of season 4 of Octonauts: “Octonauts and the Kelp Monster Mystery”. Aired 2017-10-24. Watch it online free on ZapFlix.