24,019pages on
this wiki
Add New Page
Add New Page Talk0
Mbox incomplete
Infobox incomplete
The infobox template in this article is missing some required data. You can help Nukapedia by filling it in.

Z4K-97B is a synth living in the Commonwealth in 2287.


He is a hostile synth encountered in the Institute's reactor room during the quest The Nuclear Option with any faction. Z4K-97B, along with A-2018 and XPN-20A, will serve as the game's final boss during all endings other than the Institute ending.

Interactions with the player characterEdit

Interactions overviewEdit

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


Apparel Weapon Other items On death
Synth uniform Reactor terminal password


  • Z4K-97B wears a special variant of the Synth armor which is jet black in color and can be shot off by focus fire and explosives, much like Power Armor.
  • XPN-20A and A-2018 wear identical sets of this unusual armor.
  • Said armor cannot be obtained via looting, pacify trading/armor swap, companion inspecting, etc.
  • Z4K-97B will always spawn as a Legendary enemy.


Z4K-97B appears only in Fallout 4.

Mbox stub
Expansion required
This article is too short to provide more than rudimentary information about the subject. You can help Nukapedia by expanding it.

Also on Fandom

Random Wiki