A man pursues stand-up comedy encouraged by his fellow garbage man. Though his friend, who accompanies him on accordion, continues to tell him how great he is, he actually stinks. When the "comedian" grows a third arm out of his back, the friend uses this twist to get him signed up with a sleazy talent agent, and it begins to look like his career is on the move, even though his girlfriend has left him.

The Griswold family hits the road again for a typically ill-fated vacation, this time to the glitzy mecca of slots and showgirls—Las Vegas.

In an underground fight club, blackbelt Travis Brickley is killed after losing to the evil martial arts master Brakus. Travis' death is witnessed by Walter Grady, the son of his best friend Alex Grady. Alex and his partner, Tommy Lee, vow to avenge their friend's death by defeating Brakus and shutting down the fight club.