With Hayden's wealthy father on his passingbed and preparing to bequeth Hayden's favorite staff, Gerry attempts to ingratiate himself to the young student. Meanwhile, Lisa and Robert are named co-principals, shifting the balance of power; and Nisha ruins an innocent children's game.
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.