Savage Dragon #34

Brainiape, who is revealed to be Adolph Hiter's brain preserved within the body of a gorilla, is sent on a mission to kill the Dragon by Cyberface, the defacto leader of the Vicious Circle. Cyberface is decomposing, so to save him, Abner Cadaver summons the creatures of the undead, who attack the world-renowned paranormal investigator Hellboy.

Description from Image Comics