Piranha 3DD is a 2012 American 3D horror comedy film directed by John Gulager and written by Marcus Dunstan and Patrick Melton. It is a sequel to the 2010 film Piranha 3D, part of the Piranha film series, and stars Danielle Panabaker, Matt Bush, David Koechner, Chris Zylka, Katrina Bowden, Gary Busey, Christopher Lloyd, and David Hasselhoff. The events of film take place after those of the previous film and include a school of bloodthirsty, prehistoric, carnivorous piranhas invading a newly opened water park in Arizona.