George Peppard

as Dr. Jake Goodwin

William Daniels

as Dr. Moresby

Louise Sorel

as Carole Simon

Strother Martin

as LeRoy Atkins

Zohra Lampert

as Dr. Norah Purcell

Oskar Homolka

as Dr. Helmut Von Schulthers

Victor Campos

as Dr. Felipe Ortega

Peter Hooten

as Dr. Madison