A sea turtle who was hatched in 1959 spends the next 50 years traveling the world while it is being changed by global warming. Born on a Baja, California beach in 1959, new hatchling Sammy must do what his fellow newborn sea turtles are doing: race across the beach to the ocean before they are captured by a seagull or crab. Thus begins Sammy's incredible fifty-year ocean journey. Along the way he meets his best friend, a fellow turtle named Ray, and overcomes obstacles both natural and man-made while trying to fulfill his dream of travelling around the world. Throughout his voyage, Sammy never forgets about Shelly - the turtle he saved on his first day and loves passionately from afar.

Sammy and Ray, leatherback turtles and friends forever, are enjoying an atoll's water and sand, shepherding new hatchlings Ricky and Ella out to sea. Suddenly, a poacher swoops in and ships them off to be part of a spectacular aquarium show for tourists in Dubai. The kingpin of the place, Big D the seahorse, enlists them in his plans for a great escape. But with their new friends Jimbo the bug-eyed blob fish and Lulu the snippy lobster, Annabel the sweet Octopus, and a whole family of penguins, Sammy and Ray hatch breakout plans of their own. That is when little Ricky and Ella arrive, determined to break in to rescue them. After a series of thrilling adventures and narrow escapes, our heroes head south to meet up with Shelly, Sammy's first and only love.

Nestled deep undersea next to a deserted island is the paradise home of Sammy and his turtle family. Their peaceful reef village is hidden from the wild blue ocean and the danger that lurks in it. Young turtle Ricky dreams of leaving his safe home in search of adventure but nobody takes him seriously. He's still so little! But when a mysterious creature threatens the reef's safety, Ricky and his friends must embark on a mission to find the monster and save their home.