Calificación
Reparto

Ed Nelson
Dr. Paul Kettering

Joanna Lee
Alice Summers

Cornelius Keefe
Senator Walter K. Powers

Alan Jay Factor
Glenn Cameron

Jody Fair
Elaine Cameron

David Hughes
Dr. Wyler

Robert Ball
Dan Walker

Phil Posner
Sheriff

Orville Sherman
Mayor Cameron

Henry Randolph
Telegrapher

Hampton Fancher
Zombie (uncredited)

Leonard Nimoy
Professor Cole

Doug Banks
Doctor

Saul Bronson
Prof. Helsingman