One Piece: Fish-Man Island Saga is a retouched and condensed version of the One Piece anime adaptation of the Fish-Man Island Saga.

The episode begins telling the story of Goku up to the present of the series. The episode goes on to introduce his son Gohan, named after Goku's grandfather. Although a stranger appears in a space pod in search of someone by the name of Kakarot. Who is he, and who is Kakarot?