Story

A hulking cephalopod that lives in a cave at the bottom of the ocean.
Goku and his allies wander into said cave while searching for a Dragon Ball, but they get more than they bargained for when it turns out to be a hidden pirate base!
Goku gets separated from Bulma and Krillin during a battle, and while racing to catch up with his friends falls through a trapdoor where Giant Octopus lurks, waiting for its next meal.
After gloating "Nyeh heh heh... My first prey in ages...!", the oversized octopus grabs Goku with one of its arms and repeatedly bashes him against the walls of his abode, planning to make a scrumptious Saiyan supper out of the lad once he tired.