When red-hot volcanoes start a chain reaction of disasters across the ocean, the Octonauts must work together to face their biggest challenge yet.

In this musical special, the Octonauts must find a way to hold back hungry swarms of coral-eating starfish to save a new friend’s fragile reef home.

The Octonauts embark on an underwater adventure, navigating a set of challenging caves to help a small octopus friend return home to the Caribbean Sea.