Overview
Munchies is a 1987 comedy horror film starring Harvey Korman, Charlie Stratton, and Nadine Van der Velde. Directed by Tina Hirsch, the film editor for Gremlins, the film features a similar plotline.
Plot
The protagonist's father, space archaeologist Simon Watterman, discovers a "Munchie" in a cave in Peru. Bringing the specimen back to the United States, Simon's son Paul and his girlfriend Cindy name it Arnold. Cecil Watterman, Simon's evil twin brother and snack food entrepreneur, kidnaps Arnold while Cindy and Paul are making out.
When Arnold is hurt by his kidnappers, it becomes aggressive and attacks Cecil's adopted son. Attempting to kill Arnold, they chop him into quarters, but instead of dying, Arnold multiplies into four new Munchies. The quartet of creatures develop a love of women, attacking people, beer, and junk food in the process.
Eddie is incapacitated by the Munchies as they turn their attention on Cindy and chase her through the Calsnax storage facility, but she hides from them in a shed. The Munchies begin operating the machinery and use it to cut themselves into pieces, multiplying themselves further, but Paul electrifies the assembly line with a cable, turning them to stone. He proceeds to destroy their petrified remains and Cindy reveals herself from hiding, but as they are reunited, a lone Munchie presumed to be Arnold attacks Paul. They are able to fight Arnold off and turn the Munchie to stone by electrocution, but do not destroy it since Paul wants to keep it intact for Simon's evidence.
From Wikipedia (CC BY-SA 4.0).