Octonauts Season 4 Episode 21 Octonauts and the Kelp Monster Mystery ( Air Date 2017-10-24 ) Genre Kids, Animation, Action & Adventure category. Overview "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.".
Octonauts Season 4 Episode 21 Octonauts and the Kelp Monster Mystery
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- Stars: Keith Wickham, Simon Greenall, Jo Wyatt, Rob Rackstraw
- Director:
