Johnny
Casper Farrell
McGuire
Jonathan Harker
Narrator
Governmental message announcer (voice)
Mayor Hoffstein
Detective Adam Levine
Brian
Todd
Paul Beaumont
James Grady
The Mystery Man
Dad
Cain
Drew
Perry
Dale
The experimenter
Farmers Market Vegetable Salesperson (Uncredited)
Stan Kamen
Mr. Tuttle (voice) / George Wormington (voice)
Tony (voice) / Dark Dumpster Derek (voice) / Fancy Derek (voice)
Mr. Tuttle (voice)
Mudslide (voice)
Cousin Steve
Young Red