"When a school of mutant piranha is accidentally released into a river -- and headed straight for a kids' summer camp -- it's up to investigator Maggie McKeown (Heather Menzies) and local woodsman Paul Grogan (Bradford Dillman) to prevent the potential carnage. This low-budget cult classic directed by Joe Dante (Gremlins) features surprisingly sharp humor, memorable dialogue and an unusual cast of characters."