Glenn Corbett as Neil Stryker

Cameron Mitchell as George Benedict

Sharon Acker as Dr. Bettina Cooke

Lew Ayres as Prof. Dylan MacAuley

George Coulouris as Max Greene

Dean Jagger as Carl Webster

Steve Franken as Henry Maitland

Tim O'Connor as Dr. Revere

Jerry Douglas as Steve Perry

Arch Whiting as Mike Frome

H.M. Wynant as Eric Stoner

William Bryant as Truck Driver

Virginia Gregg as Ward E Administrator

Steven Marlo as Guard

Ben Wright as Doctor

Buck Young as Tom Nelson

William Harlow as (uncredited)