William Wintersole

as Dr. Paul Florino

as Referee

as Businessman

as Blythe

as Dr. Percy

as Tom Cleveland

as Commander

as Dr. Ramsay

as Dr. McCandless

as Lt. Col. John Teasdale

as Lab Technician

as Sheriff Gibbons

as Cmdr. Robbins

as Tom Henderson

as Mr. Perrins

as Chief Peck

as Larry Benjamin

as Julius

as A Patrolman

as Dr. Hunt

as Club Manager

as Dr. Kessler

as Klaus

as Sanatorium Attendant (uncredited)

as Tony's Doctor (uncredited)

as Alien

as Carr

as The Captain

as Doctor in Operating Room

as The Captain

as Mueller

as Raskov

as William Goslin

as Abrom

as Provost Marshall Ross

as Desk Clerk

as Pilot Billy

as Prof. Andrew Whitsett