PDA - The Doom Wiki at

The PDA (personal data assistant) is one of Doom 3

Pat Harvey, Doom Wiki

Doom's protagonist - The Doom Wiki at

Steam Community :: Guide :: DOOM 3 - PDA Video Discs

Tapwave Zodiac - Wikipedia

Grand Theft Auto: Chinatown Wars - Wikipedia

Revenant (Doom 3), Doom Wiki

What are some other characters that keep a game from having little to no dialogue since the protagonist is mute? : Doom

Pirate Doom - The Doom Wiki at

H. Feiner - The Doom Wiki at

Doom RPG (2005) - MobyGames

MAP20: The Death Domain (The Plutonia Experiment), Doom Wiki

DSDA-Doom - The Doom Wiki at