Mr. X is a code name used for a Tyrant-type bioweapon in the Biohazard (Resident Evil) series. In the original Resident Evil 2, he appears as a towering, trench-coated pursuer sent by Umbrella to eliminate survivors and recover evidence. Silent, relentless, and nearly indestructible, he serves as a major source of tension and horror throughout the game. His role is to stalk the player, block progress, and embody Umbrella’s brutal bio-organic weapon program.