Piranha is a 1978 American comedy horror film directed and co-edited by Joe Dante from a screenplay by John Sayles, based on a story by Richard Robinson and Sayles. The film stars Bradford Dillman, Heather Menzies, Kevin McCarthy, Keenan Wynn, Barbara Steele, and Dick Miller. It tells the story of a river being infested by lethal, genetically altered piranha, threatening the lives of the local inhabitants and the visitors to a nearby summer resort.