Hugh O'Brian as Killian

Anne Francis as Jean Marshek

Marilyn Maxwell as Maude Webber

Marie Windsor as Lottie Clampett

Sherry Jackson as Nancy Belacourt

Robert F. Simon as Col. Donahue

Richard Kelton as Lt. Charring

Cynthia Hull as Mit-O-Ne

Pepe Callahan as Lt. Santos, the Mexican

Ed Call as Sgt. Frame

John A. Neris as Sgt. Elmer Cass

Troy Melton as Cpl. Isham

Joseph Kaufmann as Pvt. Bishop

Chuck Hicks as Cpl. Hearn

Jim Boles as Warden

Michael Keep as Cadete, the Mescalero

Loie Bridge as Margie Britt

Kaye Elhardt as Mary Kroll

Pedro Regas as Old Indian