Perennially stoned Cheech and Chong tear through the city of Los Angeles, causing trouble wherever they go. After Cheech loses his job, the two pot enthusiasts head to the welfare offices where Cheech's girlfriend, Donna, works. Instead of collecting unemployment, they find themselves thrown back on the streets, searching for a way to earn new income. But when Cheech's cousin, "Red" Mendoza, arrives, things get even crazier.

Primarily a spoof of the Friday the 13th series, but also takes shots at several other horror films. After his family moves to a new house, a young boy discovers a mysterious book describing the curse hanging over the date of Saturday the 14th. Opening the book releases a band of monsters into the house, and the family must join together to save themselves and their neighborhood