If Abed from Community were a real person, his head might explode at the following news: Michael K. Williams, best known as Omar from The Wire, is joining the cast of the NBC series for at least three episodes this fall. He'll be playing the Greendale gang's new biology professor, a role series creator Dan Harmon told us about in the chat we published Friday. Deals weren't inked, however, so we couldn't tell the full story until now.

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