William Shatner
— Steve Monroe
Michael Parks
— Antonio DeLeon
Lee Grant
— Virginia Monroe
Frank Silvera
— Gen. Salazar
Victor Jory
— Dr. Henry Merrill
Charles McGraw
— Capt. Humphreys
Louise Sorel
— Alicia Salazar
Barbara Werle
— Maggie Merrill
Michael Tolan
— Reynaldo Solis
Stuart Margolin
— Rico
Valentin de Vargas
— Colonel
