Robert Forster

Prof. Paul Corwin / The Clone

Adrienne Barbeau

Margaret Corwin

Ray Milland

Prof. Meredith

David Sheiner

Prof. Sidney Hillstrom

John Lehne

Lt. Merholz

Denise DuBarry

Ann Sweeney

Jack De Mave

Roger

Thomas Bellin

Ed Linnick

Heather Hobbs

Jenny

Eddie Quillan

Watchman

Raye Sheffield

Clone

Russell Shannon

Guard

James Nolan

Dr. Tapler

Madeleine Shaner

Audrey Linnick

Johnny Hock

1st Skater

Tom Elliott

2nd Skater

Thomas McGowan

Andrew Pauletta (uncredited)

John Herman Shaner

Fire Captain (uncredited)

D.A. Young

Lance (uncredited)