It's Halloween time! P.J. orders Geneva and Mark to go chaperone the Halloween party at the high school. Mark teaches a science class and finds out that Earvin is mad at his father for leaving him when he was born. Mark decides to fly in his father from New York. Meanwhile, Geneva has to sew a costume for Tyler, Vanessa, Nicole, and herself. Geneva sews a horse costume and Nicole and Tyler can't decide who to wear the head. Can Geneva satisfy them all? The father comes in but he is White. Earvin does not care if his father is a different race but is still mad at him for leaving him when he was born. Mark dresses up as a doctor and Earvin's father dresses up as a grape. Mark invites Earvin's father to go to the dance and try to patch things up with Earvin. Can Earvin forgive his father for leaving him?

During detention, Mark gets the kids to write job applications. Earvin gets a job and drops out of scool. He starts working at a hamburger restaurant (Clown Burger). Since it was Mark's idea to write the application, Earvin's mother tells Mark to go to that restaurant and talk Earvin into coming back to school. Mark brings Tyler and Nicole when he goes down there. In the hamburger restaurant, Mark argues with Earvin and tries to embarass him. Finally, he gets Earvin top come back to school. But Earvin's mother still wants Earvin to have a part-time job and Mark is going to help him get one.

Mark advises Earvin to slow down his romance with his new girlfriend Lisa. However, Mark's good intentions prove ill advised when Earvin, after listening to Mark, decides to elope with Lisa.