Jack hears tales about a race of amphibians living in an underwater city who have a time machine. He searches them out, and they agree to let him use the machine, but the creatures have not been entirely truthful.
Made by Genndy Tartakovsky, this cartoon tells the story of a great warrior displaced to the distant future by the evil shape-shifting wizard Aku. The world has become a bleak place under the rule of Aku, segregated into fantastic tribes and ruled by Aku's evil robot warlords. Jack travels this foreign landscape in search of a time portal that can return him to his home time so he can 'undo the future that is Aku!'.
Samurai Jack - IX: Jack Under the Sea Synopsis and Schedule