Z4K-97B

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.

Appearances
Z4K-97B appears only in Fallout 4.