Deathshead

After the Übersoldat is destroyed, Deathshead shouts over the speakers in frustration and astonishment before escaping in a Kobra rocket-plane and disappears for the rest of the game.

Blazkowicz eventually breaks into Deathshead's underground research complex, the Secret Weapons Facility.

Finally catching up with Deathshead, Blazkowicz comes face to face with a completed and fully armored Übersoldat, and kills the researchers who have developed it.

There he encounters the horrific fruits of Deathshead's labors: creatures, malformed, and twisted through surgery and mechanical implants.