Brian Robbins as Steve Williams

Bill Calvert as Kevin

Tricia Leigh Fisher as Katie

Gerrit Graham as Bud

Robert Vaughn as Colonel Masters

Larry Cedar as Graves

Bianca Jagger as Velma

Larry Linville as Dr. Jewell

Judd Omen as Sam

Jack Riley as Wade

Sandra Kerns as Melissa

Norman Fell as Tyler

June Lockhart as Gracie

Rich Hall as Stan

Robert Symonds as Proctor

Priscilla Pointer as Dr. Berlin

Frank Birney as Barber

Clive Revill as Dr. Kellaway

Sarah Berry as Onlooker

Mary Margaret Patts as Teen

Gregg Binkley as Teen

Warren Selko as Teen

Andy Steinlen as Teen

Robert Englund as Man in Trenchcoat (uncredited)

Winifred Freedman as Ticket Taker