Jeff is on the case during the episode "Cooperative Calligraphy." He's out to determine which member of the group swiped Annie's pen.
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Welcome to Halloween at Greendale. On the episode "Epidemiology 206," the group must deal with fellow students turning into zombies.
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Yes, there's a Greendale flight simulator. Jeff and company get launched in it on the episode "Basic Rocket Science."
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Poor Pierce. He believes his late mother has been vaporized and will one day return in full body form.
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Drew Carey guest stars on the Community episode "Accounting for Lawyers." He portrays an attorney.
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Jeff takes on some bullies on the episode "The Art of Discourse." This character is played by Joel McHale, of course.
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Jeff and Michelle have a discussion in the episode "Basic Genealogy." They are played by Joel McHale and Lauren Stamille.
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Pierce comforts Jeff in this scene from Community. It's courtesy of the episode "Basic Genealogy."
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Community Quotes

Me and Abed have an agreement. If one of us dies, we stage it to look like a suicide caused by the unjust cancellation of Firefly. We're gonna get that show back on the air buddy!

Troy

Annie: When you found out I was Jewish, you invited me to a 'pool party' that turned out to be a Baptism.
Shirley: Well excuse me for trying to sneak you into Heaven.