Michael apologizes to Oscar, after he finds out he's gay, for calling him a homosexual slur--but his apology outs Oscar to the entire office. And Jim decides to take a promotion at the Stamford office.
Michael and Dwight go to a convention in Philadelphia and run into Jim, and Michael becomes jealous of Jim's relationship with his new boss. Meanwhile, Pam gets ready for her first date since her engagement.
Michael is in trouble once again as Jan busts him for declaring it's "Movie Monday" where everyone watches a movie and neglects work. Angela pushes Dwight to make a move on Michael's job while Pam and Jim find creative ways to waste time.
Michael encourages the entire Scranton branch to support Kelly and attend a local celebration of Diwali, the Hindu Festival of Lights. Meanwhile, Andy convinces Jim to turn a late night of work into a drinking game.
When Jan tells Michael that the Scranton Branch will be shutting down, Michael strives to keep his staff's spirits up. Meanwhile, everyone privately begins to envision how their lives will change in the aftermath.
Jan informs Michael that the Scanton branch of Dunder Mifflin will be merging with the Stamford Branch. Jim and Pam are reunited while the other employees of both branches must adjust to their new co-workers.
Trouble among the members of the party planning committee results with the office having two competing Christmas parties, but Michael isn't interested in celebrating because he has just broken up with his girlfriend.
Dwight does a favor for Angela to keep her from getting in trouble. Andy finds out and uses it against him to get in tighter with Michael. Now Dwight must fess up, which will reveal his relationship with Angela, or risk getting fired.
Andy does the impossible--he makes everyone in the office miss Dwight, who is forced to take a job at Staples. Meanwhile, Oscar comes back to the office and Michael predictably throws a stereotypical Mexican party to celebrate.
Michael asks Jim to get a male stripper for Phyllis's office bachelorette party, but he gets a Ben Franklin impersonator instead. Meanwhile, the men's bachelor party goes as planned until Michael becomes uncomfortable with the stripper.
Michael is a guest speaker for Ryan's business class, but they have a falling-out after Michael finds out that Ryan spoke negatively about Dunder-Mifflin. And back at the office, Dwight tries to kill a bat that he found in the ceiling.
While Michael and Jan go to their first Dunder Mifflin outing as an official couple, the office workers left behind go out for happy hour. During happy hour, Roy finds out that Jim and Pam kissed at Casino Night.
Dwight saves Jim from an attack by Roy, but Dwight won't allow Jim to thank him for it. Meanwhile, Darryl asks Michael for a pay raise, and Michael discovers that he is woefully underpaid--so Michael goes to headquarters to ask for one himself.
Andy returns to the office after weeks of anger management training, determined to make a fresh start with all the Dunder-Mifflin employees. Meanwhile, it's safety training day in the office, and Michael and Dwight are on a mission to illuminate the dangers of the workplace.
Michael tries to be proactive during a watermark crisis, but only makes the situation worse. Meanwhile, Angela has trouble being apologetic with customers, and Andy discovers a secret about his new girlfriend.
Phyllis gets flashed in the parking lot, and Dwight goes all out to secure the premises. Michael ostensibly takes the women in the office to the mall to comfort them, but he's really doing it to get advice about breaking up with Jan.
Michael appoints Dwight as regional manager, anticipating that he will receive the job at corporate. Jim and Karen also interview for the same position. And Michael gets back together with Jan after she gets a boob job.