Theresa Chasar (Doom 3)

Theresa Chasar was one of the few female UAC employees in Doom 3. According to her PDA, she was involved in research with other UAC scientists on the Plasma gun. She was also friends with Dr. Elizabeth McNeil. Being one of the few women on Mars, she was forced to put up with a considerable amount of unwanted flirting from her male co-workers, particularly her boss Lloyd Renstrom.

During the Enpro level, the player can hear a female voice crying. When the player enters Theresa's office, a cutscene takes over in which Theresa pleads for help. Before the Doomguy can do anything, however, a Lost Soul suddenly tears itself out of Theresa's head, ripping out her spinal cord, and attacks the player.

Many more Lost Souls are encountered during the game, although this is the only time when one is seen to originate from a living human. How exactly the Lost Soul got to be inside of her in the first place is not known.

Trivia

 * Theresa is the only female character to be seen in Doom 3.
 * Many players mistakenly believe that Theresa's head tears itself from her body and transforms into a Lost Soul. However, if one views the cutscene in slow motion, they will see that the Lost Soul actually comes out of Theresa's head. Also, when gameplay resumes, if the player looks at her corpse closely, they will see that her head is still attached to her body.
 * Theresa is named after the sister of Tim Willits, the co-owner of id Software.