Malcolm Betruger

Dr. Malcolm Betruger is a character from Doom 3, voiced by Philip L. Clarke. He is the head scientist of the UAC on Mars.

At the start of Doom 3, Betruger is being investigated by Councilor Swann for his strange activities. Before the events of the game, he took a trip to hell, believing that the reports of insanity in returning people from the teleporter was false (as told in the video report by one of the sole remaining scientists). He returned, possesed by the devil himself, represented by a deep voice and deep laughter at certain points in the game. He then becomes a madman obsessed with the occult and satanism. In the beginning of the game, he steals the soul cube from the Mars Base and secures it in Hell so that the Marines there have no chance of combatting the forces of Hell, especially its mightiest warrior, the Cyberdemon, who is vulnerable only to the soul cube's attack. Even when the demons are destroying all resistance on Mars, he refuses to turn over complete control of the base to the Marines. When marine reinforcements arrive at the base, they are unable to find Betruger because he is in hell.

Dr. Bertruger makes a second appearance in the Doom series merged with the Maledict (He can also be seen merged with the Maledict in the ending cutscene of Doom 3) in Doom 3: Resurrection of Evil. There, he is slain by the Doomguy.

Dr. Betruger as the Maledict
When Betruger merged with the Maledict, he was planning its revenge against the humans for frustating its plans. Two years has waited to attract the UAC at Mars, once again. When the player touches the Artifact, Betruger knows they are there.

''Hell reaches out for what is ours. We have been unbound''

''They have arrived, my children.... as I promised.''

Hunt them down 

Our new reign begins...now

-Betruger introducing the new invasion at the beginning of Resurrection of Evil.

Welcome to your death

-Betruger taunting the player.

Worthless human, this fight has only just begun 

-Betruger after the defeat of the first Hell hunter

Return what is ours 

-Betruger before he was killed by the Doomguy.

Trivia
Betruger's name comes from the German word "Betrüger" which means "deceiver" or "traitor".

Dr. Reinhard from Evil Dead: Regeneration has several similarities to Betruger. In addition to looking similar (with a solid white eye), both were said to have been good before their pacts with the undead. They also have German names.