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Based on Gerry Dee's real-life experiences as a high school teacher before he switched to comedy full-time, MR. D is a story about a charming, under-qualified teacher trying to fake his way through a teaching job, just like he often fakes his way through life.
The "Insider's Look" exposé on Gerry costs him his job and makes it impossible to get a new one, so he has no choice but to get as far away as he can to start a new life, leaving Xavier behind.
When Gerry's officially introduced as Xavier's new principal, the staff's obvious disappointment leads Gerry to try and gain their trust by making some drastic moves he thinks everyone can appreciate.
Slime is all the rage across Xavier, leading Gerry to ban it. Gerry also learns, however, that slime is actually a pretty lucrative business... and his ban just created a vacuum.
Gerry's approached by a producer who wants to use Xavier as a backdrop for a movie, but he gets too caught up in the details to see the big picture.
When Gerry's almost injured in a staffroom incident, he's disappointed to realize the staff's indifference over his near-death experience.
When Gerry realizes how poorly he's been taking care of himself, he adopts Dwyer's strict diet. Diets require the kind of discipline Gerry lacks, however, so he decides that if he has to suffer, the entire school has to suffer with him.
Bobbi and Robert's big day is fast approaching and, tired of being alone, Gerry desperately wants his own partner. His search takes him online, but doesn't exactly translate to love.
The year's coming to an end, and the graduating students ask Gerry what the annual Parting Gift from the principal is going to be. The tradition is news to Gerry, but he’s going to go big, or go home.
