The Marine in "Doom 64" is less muscular, with slightly modified green armor with black highlights, a black helmet with an antenna, and a blue visor. In "Wolfenstein RPG", it is hinted that the Doom 64 Marine is a descendant of William "B.J." Blazkowicz, to whom the Marine's helmetless look in the original games bears a striking similarity. In a reference to the Marine's confrontation with the Cyberdemon, when Blazkowicz defeats the "Harbinger of Doom", the creature states that he will return in the future to confront his descendants.