Welcome Back, Kotter

In the episode, the company tech support employee gives Michael the ability to read his employees' e-mails, causing him to find out that Jim is throwing a party that Michael was not invited to. Meanwhile, Pam begins to suspect that Dwight and Angela might secretly be having a relationship.

Walter White, a 50-year old chemistry teacher, secretly begins making crystal methamphetamine to support his family when he finds out that he has terminal lung cancer. He teams up with a former student, Jesse Pinkman, who is a meth dealer. Jesse is trying to sell the meth but the dealers snatch him and make him show them the lab. Walter knows they intend to kill him so he poisons them while showing them his recipe.

Doug's union is still on strike, so he takes a job as a substitute teacher at his sister, Stephanie's school. Doug thinks it's going to be an easy job, but it turns out to be much more challenging than he anticpates. Meanwhile, Carrie has picked up some extra work for her boss, and discovers that the case is pro bono and she won't be getting any overtime pay.