Psycho Mantis was a psychic member of FOXHOUND, who participated in the armed takeover of Shadow Moses Island in 2005. He wore a special gas mask to help prevent people's thoughts from "forcing their way into his mind." In 1984, Mantis primarily found himself attracted to those who harbored negative feelings, thus accompanying the "Man on Fire" in his pursuit of vengeance. He would later work as a child soldier for XOF under the code name Tretij Rebenok (Russian for "Third Child"), until finally defecting from the organization after allying himself with a young Liquid Snake.