Doctor Matthias Jäger was a mysterious Nazi alchemist who desired to use the powers of the Philosopher's Stone in 1947 to resurrect an army of Nazi soldiers and bring about the return of the Third Reich to its former glory which it had recently lost in World War II.
Following the end of World War II, Dr. Jager became known for conducting reanimation experiments. In 1947, Jager employed a variety of henchmen ranging from ordinary thugs to former SS troopers, chief among them was the fanatically loyal Dunkelvolk. His face was hideously disfigured and corpse-like, which earned him the nickname, "The Monster of Minsk". 
Unfortunately for Jäger, he and his goons ran afoul of two foes: Major Nadia Kirov, who had long pursued him for his past crimes in the war, and American archaeologist Indiana Jones, who was also searching for the Philosopher's Stone to keep it out of the fascists' hands.
Despite these setbacks, Dr. Jäger successfully acquired the parts of the stone, captured both Nadia and Indy, and attempted to unify the stone fragments in a ceremony under the full moon. It was partially successful as the corpses of deceased Nazi officers were waking up, but Dr. Jäger was not pure of heart to wield the Stone and was disintegrated by its awesome power, taking the zombies with him.
Personality and traitsEdit
In addition to being a fanatical follower of Nazi leader Adolf Hitler, Jäger was so consumed with restoring the "former glory" that Germany had lost in World War II, that when he learned about the possible existence of Philosopher's Stone, he became determined to find it and see his country's rebirth despite his allies' skepticism about the supernatural.
Behind the scenesEdit
Matthias Jäger bears resemblance to Adolf Hitler in Indiana Jones and the Iron Phoenix. The comic was adapted from a shelved LucasArts game of the same name where the Nazis try to resurrect Hitler himself from his ashes after World War II, which may have influenced this appearance.
While Jäger's role in the original Iron Phoenix story is largely the same as that in the comic book, there were some differences that did not make it into the published story. Although he retained his nickname as "The Monster of Minsk", Jäger was not disfigured and had a personal connection to Nadia Kirov in that he was directly responsible for her family's death at a concentration camp.
His dream was to resurrect Adolf Hitler specifically which brings about his own demise as he successfully revives the Führer in Bolivia only to be killed by the transformed Hitler in a single blow for bringing him back with no military with which he can reclaim his power. Instead, it was Hitler who was the one to be killed by the power of the Philosopher's Stone.