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Greg Jenko is Schmidt's athletic partner. He was popular in high school but barred from prom over his grades. Channing Tatum plays him in both films.
Jenko gets the arts and humanities classes, but the identities get mixed up and he ends up in AP Chemistry. He gradually befriends his classmates and warms to geeky hobbies. He and Schmidt end up trading roles at school.
At college Jenko befriends the jocks Zook and Rooster, who become prime suspects in the case. He starts going to parties with them and warms to the idea of joining the football team. That pulls him from Schmidt and causes the partnership's first real friction.
In the second film's end credits, Jenko and Schmidt go on dozens of fake missions. In one, Schmidt is played by Seth Rogen, and only Jenko notices.
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