Captain America: First Vengeance
In February 1934 Himmler was at the Deutsches Operhaus in Berlin. With him were Adolf Hitler, the German dictator, and Ernst Kaufmann, head of the Sturmabteilung's (SA) Special Weapons Division. There, he met Johann Schmidt, the German Physicist who revealed them his theory that Norse gods and their magic could be more than myth. Hitler was intrigued by Schmidt's ideas, but Kaufmann was less impressed. However, Himmler saw some value in what Schmidt had to offer and befriended him. Later, during the "Night Of The Long Knives", Himmler allowed Schmidt to personally kill Kaufmann.
The demonic "ghost" of Himmler would return briefly as the villain known as Zyklon, working (somewhat ironically) with the demonic "ghost" of Stalin, known as Coldsteel.