The Doom Slayer is the protagonist and playable character of Doom, Doom II: Hell on Earth, Final Doom, Doom 64, Doom (2016), Quake Champions, Quake III Arena and Doom Eternal (and possibly Doom 3 ). He is also known by the UAC as DM1-5, DOOM Marine or The Slayer, and by the Demons of Hell as the Doom Slayer, the Unchained Predator, the Beast or the Hell Walker. Depending on the version of the character, his real name or aliases include William Joseph "B.J" Blazkowicz and Flynn Taggart. He is known in the flashback subtitles as Doomguy.