Summary: Corn grain contaminated with steroids produces large rats the size of small dogs who begin feeding on the residents of Toronto. Paul, a college basketball coach, teams up with Kelly, a local health inspector, to uncover the source of the mysterious rat attacks and they eventually try to prevent the opening of a new subway line as well as find the mutant rats nest quickly, or there will be a huge massacre of the entire city! (imdb)

Genre: Horror

Country: Canada

Directed By: Robert Clouse

Written By: James Herbert, Lonon F. Smith

Starring: Scatman Crothers, Sara Botsford, Cec Linder, Sam Groom, Lisa Langlois, Lesleh Donaldson

More information at the Internet Movie Database