Eel (The Curse of the Hex)
The giant golden eel only appears in the spongebob episode "The curse of the hex".
Looks
It acts stupid and looks stupid too, but it is very strong. But it hurts when someone lightly punches it.
It even almost strangled Mr.Krabs to death.
Trivia/Goofs
At the end of the episode when it bursts out of the krusty krab, it looks like a jack in the box.