After his capture in the wilderness, the legendary, bloodthirsty creature 'Chupacabra' escapes into the city creating mayhem and panic. As they pursue the deadly beast, an animal control officer and scientist realize that a vigilante with his own suspicious motive is also tracking the elusive killer for a mysterious research facility run by Dr. Goodspeed...

Magaly enters a TV contest looking for Marilyn Monroe look-alikes, pressured by her husband and a money prize of $25,000 to help them overcome their precarious financial situation. During the casting for the contest, Magaly meets Norma, her strongest and cheating competitor, a voluptuous version of Marilyn ; and Rossel, the sponsor, a well-suited millionaire who is sure about conquering her. Looking for an adviser for the contest, Magaly and Arturo find Hector, a transvestite that believes himself to be Monroe's reincarnation. He tries to do with Magaly what he cant do with himself as a man: to become the real Marilyn Monroe. In the process of becoming Marilyn Monroe, Magaly suffers an identity crisis that mimics the life of the mythical blonde.