Our high-tech use of the ocean for food, transportation, and energy has far-reaching effects, particularly on certain species. Focusing on issues from noise pollution to microplastics, we can mitigate our impact to provide better futures for ourselves as well as for marine life. The work begins with understanding the extent of our true impacts.

Saltwater crocodile: A giant saltwater crocodile wanders into freezing waters so the Octonauts try to return the predator to its warm water home -- Decorator crab: When important objects go missing from their ship, the Octonauts stake out the thief who turns out to be a decorator crab, stealing their things to decorate his shell -- Giant spider crab: Kwazii is frightened when he spots a giant underwater spider, but it turns out to be a very old spider...

Join the Octonauts as they embark on not one, not two, but twelve rescue missions! From attempting to dive deep into the abyssal zone to encountering a school of toothy barracudas to Barnacles seeking guidance from a mysterious sea turtle. It's time to sound the Octo-alert!

Cookiecutter sharks: Captain Barnacles and the crew investigate why mysterious holes have started to appear in their equipment -- Lost lemon shark: The underwater explorers go in search of a lemon shark that has hurt its nose and is struggling to find its way home -- Dwarf lantern shark: Captain Barnacles and the team try to find an injured dwarf lantern shark -- Giant jelly: The crew tries to rescue Peso when he becomes trapped inside a giant jelly...

When Dory, the forgetful blue tang, suddenly remembers she has a family who may be looking for her, she, Marlin, and Nemo take off on a life-changing quest to find them, with help from Hank, a cantankerous octopus; Bailey, a beluga whale who's convinced his biological sonar skills are on the fritz; and Destiny, a nearsighted whale shark! Dive into the movie overflowing with unforgettable characters, dazzling animation, and gallons of fun!