Dee Wallace as Donna Trenton

Danny Pintauro as Tad Trenton

Daniel Hugh Kelly as Vic Trenton

Christopher Stone as Steve Kemp

Ed Lauter as Joe Camber

Kaiulani Lee as Charity Camber

Billy Jayne as Brett Camber

Mills Watson as Gary Pervier

Sandy Ward as Bannerman

Jerry Hardin as Masen

Merritt Olsen as Professor

Frank Welker as Cujo (voice; uncredited)

Clare Torao as Reporter

Arthur Rosenberg as Roger Breakstone

Robert Craighead as Joe MaGruder