Benign Intervention

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Benign Intervention is a companion quest in Fallout 4.

Quick walkthroughEdit

Companion Quest: Benign Intervention
Gain Cait's approval.
Bring Cait to Vault 95.
Locate the clean room.
Speak to Cait.
Wait for Cait to get in the clean room chair.
Use the terminal to cure Cait's addiction.
Speak to Cait.
Reward: 200 XP
Cait is cured of her addiction.

Detailed walkthroughEdit

  1. Once Cait trusts you enough she'll tell you about her history and her current struggles with addiction, then suggest going to Vault 95 to seek treatment.
  2. Head to Vault 95 near the middle of the land area on the south side of the map, SW (and across the river) from Egret Tours Marina.
  3. The Gunners have claimed the vault, so you'll need to fight your way in. The room on the right after leaving the elevator (locked with an Advanced lock) has a terminal that can be used to deactivate some turrets ahead. Watch out for traps throughout the vault.
  4. Ahead there's a large room with several enemies, a Master level terminal blocks the door to the South that leads to the detox chamber. Alternately in the Overseer's office in the upper west side there's an unlocked terminal that can open the door.
  5. Once passing by the door there's several more gunners in the cafeteria, go upstairs and around to the terminal, inside there's a Gunner commander, turret and an active bottlecap mine on the desk.
  6. Talk to Cait, she has misgivings about the process. You'll have 3 easy persuasion options, all of them give the same result. Once she gets into the chair activate the terminal and watch the chair work.
  7. Speak with Cait again once it's done and the quest will end.

Quest stagesEdit

10 Bring Cait to Vault 95
20 Locate the Clean Room
70 Speak to Cait
80 Wait for Cait to get in the Clean Room Chair
90 Cure Cait's Addiction
110 Speak to Cait
255Quest finishedIcon checkQuest complete
355Quest finishedIcon checkQuest failed


  • Before completing this quest, Cait will approve of chem use and most dialogue options in support of chem use (e.g. when giving chems to Mama Murphy). She will disapprove of those activities and statements once the quest is completed. Even as she notes her resentment of her addiction in the dialogue that triggers this quest, her stance on chem use will not change until the toxin purge is carried out and the quest completed (thus, it is possible to get one last small approval boost by consuming a chem and a bottle of liquor (of which there are plenty in Vault 95) right before initiating the toxin purge).
  • The Big guns bobblehead is off to the right after the initial firefight location. It is at the far end of the "Residential" section of the vault, in the northernmost room.


  • ps4Icon ps4 pcIcon pc xboxoneIcon xboxone The quest might not trigger after Cait's dialogue. If that happens, you can workaround this by not allowing her to talk to you about it (choose the "Maybe Later" option). You need her to not be your companion but you can't dismiss her directly without triggering the dialog. Find another one of your companions, and ask them to join you. Send Cait on her way. As she is leaving, talk to her. This will trigger the dialogue again and this time the quest will show up in your quest log. [verified]
    • pcIcon pc To trigger Cait's quest AFTER the bugged conversation, you should:
        1. Get rid of any companion (you can do this by talking to them and choosing appropriate dialogue branch),
        2. Stand in front of Cait,
        3. Open console, ` by default, execute setstage 1666c5 0
        4. You will be fast moved to a place near Vault 95 and "Benign Intervention" quest will immediately be triggered to start, so you can see it in your quest log.
        5. Talk to Cait and make her to be your companion,
        6. From this point you can be sure that if you follow all other advises in this section you will not encounter any bugs during the "Benign Intervention" quest.
  • pcIcon pc To complete the "Find the Clean Room" objective, you need to physically pass through the door leading to the Gunner commander. You may need to walk out and then back in if you use V.A.T.S. or a perk like "Blitz" to enter the room rather than by walking through the door.[verified]
  • pcIcon pc The elevator tends to get stuck upon entering it and activating the button. To fix this, simply restart the game.[verified]
  • pcIcon pc If Cait is wearing power armor when you open the door / enter the waiting room outside the Clean Room, it will disappear and not be recoverable after the procedure is finished. Have her get out of the suit outside of that area before proceeding.[verified]
  • pcIcon pc If starting the quest while already in Vault 95 via normal means it will become bugged to where returning to the entrance does not go beyond the first stage.

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