George Maharis

as Dr. Dan Summit

Cameron Mitchell

as Arnold Chester

Margaret O'Brien

as Pam Rhodes

Robert Walker Jr.

as Major Barry Wolfe

Susan Oliver

as Carla Burke

Jeremy Slate

as Cliff Rocky Rhodes

William Bryant

as Major Doc Henry

Lynnette Mettey

John Carter

Jason Wingreen

Arch Whiting

Don Knight

as Dr. King

Sandy Kenyon

as Dr. Hart