DOOM 3, en oferta por tiempo limitado Mac App Store

This is about the marines that are NPCs. For the marine that the player controls in the series, see Doom's protagonist. The Marines are a military organization present (or at least mentioned) in most of the Doom games (except the 2016 Reboot although in this aspect they are replaced by NeoPhalanx and, to a certain extent, the Elite Guard) they have an expanded presence in Doom 3, where they appear as NPCs, and allies, which are stationed on the Mars base. According to the TNT: Evilution manual,

Doom is a character in Quake III Arena as part of Tier 6, the protagonist from the original Doom games. Manual biography Long after everyone else on Phobos was dead, he kept fighting, determined to send out a warning to Earth before the demons could claim him. Profile Distracted and intelligent sounding, (but not a member of the intelligentsia, more like a well-educated tradesman) this guy may be a few cards short of a full deck, but his training serves him well. He's a bad-ass in the arenas.[