0

Doctor 0 is a pre-War scientist operating in the Big MT in 2281.

Background
Doctor 0 is a pre-War doctor who became a think tank to continue his work at Big MT. Doctor 0 specializes in robotics, although his actual degree of skill in this field is debatable. Before the War, he started a project to reverse-engineer and improve Securitrons, robots created by 0's arch-rival and eternal enemy, Robert House. His sub-psychotic rage towards Mr. House has even extended to a near-homicidal behavior towards the man, as evident from a portrait of House in his house in Higgs Village bearing several knives stabbed/thrown into it.

Despite dedicating a large facility to his Securitron research project, 0 was unable to improve on the original design: all units he worked on are either irreparably damaged or completely berserk. Ironically, the only functioning Securitron he constructed is Muggy.

His proper name is not Doctor O (the letter), but rather Doctor 0 (the number). Virtually everyone makes this mistake, which is a source of endless frustration for him. Despite his frustration, he is more-or-less resigned to answering to "O", stating that, "as long as it serves its purpose...". The mistake still rankles, however, as becomes clear should the matter be brought up with him.

Quests

 * What's In A Name?: The player must have 9 Intelligence or the Math Wrath perk in order to help him with his name problem. The player character will suggest adding a slash through the zero to differentiate between a zero and O.
 * Old World Blues: If Klein can't be convinced otherwise 0, along with 2 other members of the Think Tank, is needed to convince Klein to give up trying to escape the Big MT.
 * Picking Your Brains: After completing Welcome to the Big Empty, the player needs to talk to 0 and the rest of the think tanks to complete this quest.
 * Welcome to the Big Empty: The player has to talk to 0 as with the rest of the Think Tank.
 * When Visitors Attack!: Dr. 0 has some information on the the visitor who assaulted him and Dr. 8.

Effects of the players actions
If the player has helped out 0 with his name problem, and the player doesn't have a 100 in Science or 85 in Medicine to convince Dr. Klein, 0 sides with the player in convincing Klein to back down.

Other interactions
If the player has accessed the correct dialogue options during the initial dialogue, he will occasionally give the player 50 caps upon request.

Appearances
Doctor 0 appears only in the Fallout: New Vegas add-on, Old World Blues.

Behind the scenes

 * James Urbaniak also plays the voice of Dr. Thaddeus S. "Rusty" Venture of The Venture Bros. Doctor 0's name may be a reference to Dr. Byron Orpheous, a character from the show who is frequently referred to as Dr. O for short.
 * If you have the Wild Wasteland trait active, one of his broadcast messages across the crater asks the lobotomites to please remember to clean the walking eye. This is another reference to the Venture Bros. With Wild Wasteland, these walking eyes also appear in the Magnetohydraulics complex, although the player cannot interact with them.
 * Both names, 0 (number) and O (letter) are infinitely looping figures, which goes along with the naming theme of the Think Tank Scientists.
 * Dr. 0's personality was originally intended to by a frenetic, hyperactive newscaster type, but was re-written to a "scientist-who's-aware-he's-not-brilliant-or-valued". This can still be seen when talking to him before the main quest is finished. This may be a reference to Dr. Venture because he knows he's nowhere near as good a scientist as his father was.