Geist, fullname Nikolaus Geist, is a villain in the Marvel Universe, and an enemy towards Wolverine and Captain America.
Nikolaus Geist was a member of the Thule society. He use to assist Adolf Hitler rise to power, and eventually became his adviser during WWII. As Hitler's adviser, Geist gave Hitler ideas on how to run the concentration camps. While the other members of the Thule society gathered artifacts from Europe's hidden libraries, Geist worked on Project Lazarus to create the resurrection corps, a group of dead Nazi soldiers brought back from the dead with super human abilities. However, Geist was stopped by Captain America and Bucky but managed to escape. To escape war crime punishment, he used German rocket scientists to help the OSS.