The World War One Ace was a retired pilot from World War I, who sided with the Nazis during their search for the Joneses aboard the D-138 in 1938.
Biography
The World War One Ace was a fellow passenger of the zeppelin with Indiana Jones and his father when it left Germany.
During the trip, he drank heavily and told war stories to the other passengers. His allegiance to the Nazis (or at least his country in general) was revealed when a Gestapo agent called for any loyal Germans to help him pursue the Joneses, and he volunteered. Unfortunately, he was so drunk that when he and the agent tried to follow the Joneses in a second biplane, he neglected to turn the motor on and they fell to their deaths.
Behind the scenes
The World War I Ace was portrayed by the late Frederick Jaeger in Indiana Jones and the Last Crusade.
The sequence in which he is killed along his partner was cut from the final version of the film but remains in the film's novelization and its comic book adaptation.