Gerry decides to 'help' Bobbi with her girls' self defense class, but ends up feeling emasculated when it becomes obvious that she is able to physically dominate him. Lisa's lunch causes an uproar in the teachers' lounge, while Leung has some mysterious packages delivered to reception.
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 premise shines the light on teaching from the teacher's point of view, and as it turns out, teachers don't know everything, especially Mr. D - who struggles to keep one step ahead of his students.