During the thieves' stay in Pioneer Village, Franz was continually annoyed by the employees' refusal to break character, to the point where he executed Ol' Smithy for refusing to tell him the door code to the mine shaft.
Franz was defeated when Stan Marsh told Murderin' Murphy that Franz was the one who had "killed his pa," causing Murphy to angrily tackle the criminals' leader. This gave the police, stationed outside of the village, the opportunity to storm in. All of Franz's gang except for one man were killed and Franz himself was arrested.
He had a goatee and wore a business suit with a striped tie. He also carried what appears to be an M16 and a silenced pistol.
- In both name and overall appearance, Franz is a parody of Alan Rickman's character, Hans Gruber, from the movie Die Hard.