*The Doom Slayer is the main character in the Doom video game series, where he fights demons and the undead to save Earth from an apocalyptic invasion:

Origin The Doom Slayer is a space marine who works for the Union Aerospace Corporation (UAC). He is often referred to as Doomguy, but the character's name is never explicitly stated in the games. In the Doom 3 novels, he is named John Kane, and some believe he may be a Blazkowicz, like the family from the Wolfenstein games.

Background The Doom Slayer is semi-immortal and draws strength from his fallen enemies. He is fueled by hatred and becomes hell's nightmare, spreading fear and terror across hell.

Training The Doom Slayer is trained by the night sentinels, a civilization of warriors who grant him the status of a crowned knight sentinel.*