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

When Roger (a Robin Hood-esque, stray dog) and Belle (an elegant yet spoilt pet cat) are thrown together amidst the chaos of a robot take-over of their home city, they must push all their preconceptions aside in order to survive, as they embark on a high-stakes, action-packed adventure.