Anthony Michael Hall (Gary)
Kelly LeBrock (Lisa)
Ilan Mitchell-Smith (Wyatt)
Bill Paxton (Chet Donnelly)
Suzanne Snyder (Deb)
Fred D. Scott (Bar Patron)
Robin Frohman (Girl in Bathroom)
Michael Cramer (Weenie)
Anne Bernadette Coyle (Carmen)
Rick LeFevour (Policeman)
Jeff Jensen (Metal Face)
Phillip Borsos (Candy Bar Owner (uncredited))
Joe Gieb (Blob Operator)
Darren Harris (Weenie)
Syzy J. Kellems (Gymnast)
Alison Carole Lowe (Girl in Upside Down Bathroom)
Mikul Robins (Weenie)
Vince Monroe Townsend (Bar Patron)
Rock Walker (Policeman)
Jackie Burch
Steve James (Guy at Table)
Chino "Fats" Williams (Bar Patron)
Jill Whitlow (Perfume Salesgirl)
Prince Hughes (Party Guest)
Todd Hoffman (Weenie)
Pamela Gordon (Wyatt's Mother)
Theodocia Goodrich (Lingerie Saleswoman)
Kevin Thompson (Blob Operator)
D'Mitch Davis (Bartender)
Michael Berryman (Mutant Biker)
Ivor Barry (Henry)
Jennifer Balgobin (Biker Girl)
John Kapelos (Candy Bar Owner)
Barbara Lang (Lucy)
Britt Leach (Al)
Doug MacHugh (Wyatt's Father)
Kym Malin (Girl Playing Piano)
Renee Props (Weenie)
Vernon Wells (Lord General)
Wally Ward (Weenie)
Mary Steelsmith (Girl in Bathroom)
Johnny Timko (Weenie)
Judie Aronson (Hilly)
Robert Downey, Jr. (Ian)
Robert Rusler (Max)