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