Piranha [Roger Corman's Cult Classics] (DVD)

Mutant piranhas escape from a secret research station and head downriver towards a summer camp and a small town's lakeside tourist attraction. A gruff loner and a daffy private eye race against time to try to stop the creatures. Directed by Joe Dante. Starring Bradford Dillman, Heather Menzies, Kevin McCarthy and Keenan Wynn.