Deuce Bigalow (Rob Schneider), a diminutive fishtank cleaner (aquarist), is fired for cleaning the tank at a public aquarium in the nude.
Deuce has no success in attracting women, so he tries to stay busy with work.
On a house call, he meets a Russian male prostitute Antoine Laconte (Oded Fehr). Antoine is going on a business trip, and he asks Deuce to care for his lionfish and his home while he is away.
Deuce accidentally sets Antoine’s kitchen on fire when trying to make a grilled cheese sandwich in the toaster, and smashes an expensive fish tank.