Simon Watterman, a space archaeologist, discovers the "Munchies" in a cave in Peru. Cecil Watterman, Simon's evil twin brother and snack food entrepreneur, kidnaps the creature. What Cecil does not know is that the creature, when chopped up, regenerates into many new creatures and are they mean!

Inspector Clouseau disappears, and the Surete wants the world's second best detective to look for him. However, Clouseau's enemy, Dreyfus, rigs the Surete's computer to select, instead, the world's WORST detective, NYPD Sgt. Clifton Sleigh. Sleigh obtusely bungles his way past assassins and corrupt officials as though he were Clouseau's American cousin.