A caveman forms a bond with a dinosaur as they struggle to survive in a hostile world.
A great warrior is 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!".
Children who create imaginary friends usually take care of them until they are 7-8 years old. Imaginary friends, left on their own after this event, continue to live in this home founded by old Madam Foster.
