Dr. Nikolai Demichev

"Renko, stop! Don't let Demichev live!"

Dr. Nikolai Demichev is one of the main antagonists of Singularity and was originally a Russian scientist doomed to die in a fire in 1955 - however when the game's protagonist is transported back in time he saves Demichev's life and in the process unleashes a monster upon the world (without knowing it).

Demichev proceeds to conquer the world and becomes a major force of evil in the game, the player can choose several outcomes - which are determined by in-game actions - which can either lead of Demichev's death or an alliance that ultimately destroys the world.