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Gametitle-FO3 OA
Gametitle-FO3 OA

All right, you. Keep your weapons holstered, your hands to yourself, and your mouth shut.

Defender Sibley is a member of the Brotherhood of Steel Outcasts located at the Outcast Outpost in Bailey's Crossroads, in the year 2277.


A rather morose and suspicious man, Sibley is concerned only with furthering Outcast technological findings. He seeks to share this wealth only with those in the service of the Brotherhood Outcasts. Sibley instantly views anyone entering the Outcasts' domain as a threat, and he doesn't trust McGraw's motives. He thinks the Protector is weak-willed and gives in too easily to those who might steal Outcast bounty.[1]

Sibley comes off as harsh in your first encounter, and stays that way throughout your stay with the Outcasts. He is the one in charge of the mutiny at the end of the simulation.

Interactions with the player characterEdit

Interactions overviewEdit

General Services Quests
Essential: noIcon cross
Enslavable: noIcon cross
Companion: noIcon cross
Bounty: noIcon cross
Merchant: noIcon cross
Repairman: noIcon cross
Doctor: noIcon cross
Rents bed/room: noIcon cross
Starts quests: noIcon cross
Involved in quests: yesIcon check


Aiding the Outcasts: he takes the player to Olin and the VR pod when he's told to do so.

Effects of player's actionsEdit

Once the player completes the Anchorage Reclamation simulation and opens the locked door to the armory, Sibley will attempt a mutiny with his men against Protector McGraw, feeling that the player doesn't deserve any of the technology within the armory.

Other interactionsEdit

  • If you enter the Outcast Outpost wearing Outcast power armor, found on many of the Outcast reinforcements outside of the base who are killed, he will mistake you for one of them, and will take you to McGraw thinking this. On the way, many of the other Outcasts will assume your unit was one that recently left Lyons and the Brotherhood.
  • If your player is a female, and you have the Black Widow perk, a unique dialogue option will appear when you enter the base and speak to Sibley. He will lead you to Protecter McGraw without the aggression. He still turns on you at the end, though.


Apparel Weapon Other items On death
Outcast power armor Minigun - -


  • Defender Sibley is the weakest human antagonist in Fallout 3, as even at his highest possible level, his stats are even lower than the members of Enclave Squad Sigma from Broken Steel; His S.P.E.C.I.A.L. stats are set like those of a Scribe.

Notable quotesEdit

  • "All right, you. Keep your weapons holstered, your hands to yourself, and your mouth shut."
  • "I got loads of problems, chump. You don't want to become one, so shut up and get in the... the simulator thing there. Move it!"
  • "What's going on is this whole mission is one big rat-fuck. We've been stuck here for way too long with no results. McGraw won't give up, so we've stooped to using chumps like you to try and get something out of this place."


Defender Sibley appears only in the Fallout 3 add-on Operation: Anchorage.

Behind the scenesEdit

Outcast members Sibley, Olin, McGraw and Morrill, all of whom appear in the Operation: Anchorage add-on for Fallout 3, appear to be named after buildings on the campus of Cornell University, including Sibley Hall, Olin Hall, Olin Library, McGraw Hall, McGraw Tower and Morrill Hall.


  1. Fallout 3 Official Game Guide

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