Kommissar first appears at a car show when Das Sound Machine performs "Uprising" and "Tsunami". After the show, they approach the Barden University's Bellas and the two groups engage in a battle of wits, particularly between Kommissar and Beca Mitchell, leader of the Bellas, who can't stop herself from complimenting the German whenever she tries to insult her. Das Sound Machine later shows up at the Riff-Off and they taunt the Bellas again before the competition, which they end up winning. Their performance at Worlds is a combination of "My Songs Know What You Did in the Dark" and "All I Do Is Win", after which Kommissar engages in one final verbal duel with Beca before the Bellas go on.
- Birgitte also stated in an interview that Kommissar was attracted to Beca as well.