|Karl is a Student at Greendale Community College. He is one of four German exchange students along with Lukas, Juergen and his brother Reinhold. They are all Foosball enthusiasts who are attending the school on a scholarship for the game. Karl is less aggressive then the others and has shown to have other competitive interests outside of Foosball. His first appearance was in the Season Three episode "Foosball and Nocturnal Vigilantism".|
|In the study group's third year together at Greendale, Karl and his fellow German exchange students Juergen and Lukas are first introduced. They make their presence well known on campus by loudly beating and then berating other students at Foosball in the student lounge. Jeff becomes so annoyed by their antics he goes to confront them over the study group's objections. He attempts to sarcastically shame the trio but they Karl offers that they will stop playing if Jeff can score one point on them. Jeff accepts but fails in his attempt causing Juergen and Lukas to mock him.
The next day, Karl and the others find Jeff and Shirley in the student lounge practicing on the a foosball table. The trio taunt the pair with Juergen telling them to get away from their table. When they refuse, Juergen issues a challenge to play a game for rights to use the table. Shirley agrees but suggests a later date the following Monday morning. She also adds that they up the stakes; the losers will be forced to never use the table again. Juergen accepts the challenge and decides to demonstrate what Jeff and Shirley have to look forward to.
|With Karl and Lukas supporting him, Juergen puts his arms around their shoulders. Keeping his legs together, he swings them back mimicking a foosball player game piece. Karl then holds up a soccer ball as Jeurgen swings forward and sends the ball flying towards Jeff and Shirley. After letting Juergen down, Karl then flashes the V sign at them and the trio smugly exit. Although they are proud of the display they just put on, Jeff is less than impressed annoyed that they would waste a twenty dollar soccer ball for a stupid bit.
That Monday, Karl and the other Germans are playing at the foosball table when Jeff and Shirley show up for their match. Karl joins Juergen on one side of the table while Lukas watches from the sidelines. Jeff and Shirley start the game by passing the foosball quickly back and forth. Shirley then launches it into the air where it lands right in the middle of the table. Both Karl and Juergen try to get at the ball with their foosball players but its too far out of reach. Juergen starts to berate Karl and all three Germans start to argue amongst themselves. With the match at a standstill, Jeff and Shirley leave satisfied at the draw.