Bob O'Donnell was an actor and voice actor for video games. He worked on only a few films and video games, most notably voicing Dr. Kerr in the Bungie Studios video game Oni and the Drunken Dwarf in Myth. He also voiced a small part in Halo 2, speaking the single line by the Prophet of Objection in the opening cinematic of the game. In Halo: Reach, he is credited as the "voice of the terminals" (data pads).
- O'Donnell's part as the Prophet of Objection was not acknowledged in the Halo 2 credits. This was rectified when Halo 2 Vista was released.