Glenn Corbett

Neil Stryker

Cameron Mitchell

George Benedict

Sharon Acker

Dr. Bettina Cooke

Lew Ayres

Prof. Dylan MacAuley

George Coulouris

Max Greene

Dean Jagger

Carl Webster

Steve Franken

Henry Maitland

Tim O'Connor

Dr. Revere

Jerry Douglas

Steve Perry

Arch Whiting

Mike Frome

H.M. Wynant

Eric Stoner

William Bryant

Truck Driver

Virginia Gregg

Ward E Administrator

Steven Marlo

Guard

Ben Wright

Doctor

Buck Young

Tom Nelson

William Harlow

(uncredited)