"Party Crashers" chronicles the amusing encounter between Marco Polo (Marcelo Adnet), a Copacabana trickster, and Beto (Eduardo Sterblitch), a shy and insecure man, on the New Year's Eve in Rio. Together they crash parties and create a lot of confusion in search of the beautiful Laura.

The quartet of coup plotters is back, but before they need to resolve some minor internal disagreements, since Marco has struck a blow at his best friend, Beto, who, desolate, stops at a psychiatric clinic. It is up to Laura and Nelson to help him out of the institution.