A-2018 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. A-2018, along with XPN-20A and Z4K-97B, 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
Perk: noIcon cross
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Involved in quests: yesIcon check
The Nuclear Option


Apparel Weapon Other items On death
Synth uniform Reactor terminal password


  • A-2018 will only appear during the Brotherhood of Steel, Minutemen, or Railroad endings.
  • A-2018 will always be hostile to the player character.
  • A-2018, along with XPN-20A and Z4K-97B are the only known synths to have more than 4 characters in their names.


A-2018 appears only in Fallout 4.