Michael K. William’s Omar from The Wire is one of the all-time greatest TV characters, one full of complexity, somehow equally sympathetic and terrifying. And now he’ll be teaching the students of Greendale Community College biology, naturally. Of course, he won’t be playing a normal biology teacher, instead portraying an ex-con who’s using his prison-earned degree to teach the ways of life. He’ll be staying on for at least three episodes, and with the first episode of the season entitled “Biology 101,” we won’t have to wait too long into the season to meet him. Indeed.