G-Man (Half-Life) refers to simply as his "employers". His mysterious nature has made him an icon of the "Half-Life" series, with his identity and motives remaining almost completely unexplained. The G-Man's name comes from "G-Man", an American colloquialism meaning "Government Man". However, within the "Half-Life" games, he is identified by this name only in the program code and the multiplayer profile menu as a default name option, not within the story itself; his name is derived from his "Half-Life" model and entity name and has since been reused in subsequent games of the series. His name has been confirmed and he has
G. Callen son. After Hetty takes over the interrogation, she allows him to escape to finish what he started. Callen and Sam go to his rescue and Callen discovers that his father had a child with a woman after he helped her move to the U.S. That child has since become a parent, so Callen has a half-sister and is now an uncle. In the episode "Payback", Callen learns from Hetty that Joelle is an undercover CIA agent who has been assigned by rogue agency moles to spy on him. Feeling betrayed, Callen permanently severs his ties with Joelle. G. Callen G.