Garrett Douglas is a teacher at Beacon Hills High School and an Alpha Löwenmench, a creature part wolf and lion, who was a Hauptmann ("Captain") in the Nazi regime who was captured and held for seventy years by the Dread Doctors.
They simply called him "Der Soldat."
In 1943, Douglas, was part of the Ahnenerbe, Heinrich Himmler's personal project to use the occult to win World War II. The Nazi captain proposed the use of Ghost Riders as soldiers in their regime. However, Douglas intended to take the Riders for his own purposes.
At the Ruhr Valley in Germany, Douglas and some soldiers attempted to penetrate the rift to the Ghost Riders limbo, however, the riders attack and they are easily beaten. Douglas survives but is wounded by one of their whips.
Still seeking to control the riders, Douglas sought help from the Dread Doctors. Instead, they captured him and forced him in a tube of liquid, and then used the liquid for their experiments and to prolong their own lives. The bleeding from the whip lash “infected the water” and mixed with the fluid from the vat. The combination made Douglas stronger. He was soaking it in, absorbing the power for 70 years. Liam suggests this means Douglas came out of the tube with the power of an Alpha, a Löwenmensch, and a Ghost Rider.
After the defeat of the Dread Doctors and The Beast of Gevaudan, Douglas breaks out of the tube and escapes their lair and resumed his efforts to use the Ghost Riders, but is stopped by Scott McCall and his pack.
When he attempted to take command of the Riders once more, they surround him and he is turned into a Ghost Rider with a swastika on his arm before he is taken up by the lightning storm.