Mr. D - Season 5

Gerry hatches a new "get rich quick" scheme selling counterfeit One Direction merchandise when he finds out the band is in town. But making countless beaded bracelets at home is tedious work, and Gerry soon realizes he has a whole classroom full of potential unpaid laborers just waiting to be exploited.

When Gerry is suddenly promoted from sub to full-time teacher, his initial thrill is quickly squashed by the realization that he's back to real teaching responsibilities: namely, marking. Upon meeting a retired teacher who yearns for his old days in the classroom, Gerry concocts a scheme that seems too good to be true.

When Gerry learns that former Olympic champion Donovan Bailey is coming to town, he's determined to seek retribution for a long-standing bone he has with the track "star."

Gerry and Simon are both assigned student teachers. Gerry is thrilled to have a minion picking up the slack, while Simon is anxious about the added responsibility. Gerry soon learns that his hands-off approach will not work, as his student teacher, Gloria, is terrified of the students and requires Gerry's presence at all times.

After Gerry has an unpleasant run-in with a unionized construction worker, he decides he wants to form a teachers union at Xavier. Meanwhile, Robert reads the riot act when Malik skips out early on his janitorial duties; and Lisa is smitten with Trudy's brother.