Sid (Fallout 3)

 is an insane human in Vault 87, also known as Subject B440. He is trapped in Isolation Room 03.

Sid is armed only with a lead pipe, but he has an abnormally high amount of health (seemingly more than a Super Mutant Brute). This may be due to some form of unique mutation caused by FEV experimentation on him (or he may simply be a "boss" enemy, like Commander Jabsco, the Vault 106 Survivor, Hubris Comics' Mad Johnny Wes, or Vance). He also wears a Merc Grunt Outfit.


 * If the door is unlocked with a Bobby Pin, Sid is friendly but uncommunicative, screaming "get out of my head" and "Can't you see? Their all dead!". (This is possibly a bug within the game). If the door is unlocked by hacking the terminal, then Sid will attack you.
 * When the door bolts are blown, Sid turns hostile; even if the door was previously open.
 * If you free Fawkes by activating the lab's emergency fire systems, this will open all the other isolation rooms, freeing both Sid and a Centaur. Although both are hostile towards you, they will also attack each other if they spot each other before spotting you.

The first terminals which can be hacked near the entrance of the vault through Little Lamplight features notes on a man who slowly descends into aggression after his wife is taken by the scientists in the vault. This could possibly be Sid who had somehow been captured and locked up.

In the construction set, there are dialogue options telling that he killed all of the people in his isolation room and that he may have been captured by super mutants.

Appearances
 only appears in Fallout 3.