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Michael's "injury" from a George Foreman Grill distracts the staff from Dwight, the one with the real injury.
The Dunder Mifflin crew holds a casino party at the warehouse and Michael has two dates.
Michael uses "beach day" at Dunder-Mifflin to find out which employee would be his most capable replacement, just in case he receives the promotion to the New York office that he's applied for.
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.
Michael invites Jim and Pam and Andy and Angela to a couples-only dinner party, which makes Dwight very jealous. However, the only thing he's missing is a ringside seat to witness Michael and Jan's extremely dysfunctional home life.
Michael throws an extravagant going-away party for Toby, and falls in love with the woman who is replacing him. Jim plans to propose to Pam at the party, but gets out-staged. Back at corporate, Ryan is arrested for fraud.
Dwight's too-realistic fire alarm gives Stanley a heart attack. When he returns, Michael learns that he is the cause of Stanley's stress. To remedy the situation, he forces the office to throw a roast for him.
The Michael Scott Paper Company is gaining clients by offering lower prices than Dunder Mifflin, but is going broke in the process. However, Dunder Mifflin is losing clients to Michael, and is desperate to buy him out.
The Office travels to Niagara Falls to celebrate Jim and Pam's wedding under strict orders not to mention Pam's pregnancy. Michael, Dwight, and Andy all want to hook up with guests at the wedding and Michael and Dwight meet twins.
Niagara: Part 1
Pam is forced to deal with an embarrassing injury for Andy the night before her wedding, while Kevin deals with the loss of his dress shoes on the morning of the ceremony.
Niagara: Part 2
Michael finally finishes his movie "Threat Level Midnight" and screens it for his employees at Dunder Mifflin, but Holly is less than enthusiastic for his finished product.
Threat Level Midnight
Michael plans to propose to Holly the day of the Dunder Mifflin garage sale, but Holly may have to take an extended leave of absence to Colorado because her father is sick.
As the office gets ready for Michael's final day at Dunder Mifflin, Michael doesn't tell anyone that he's leaving a day early. Meanwhile, Deangelo accompanies a nervous Andy on a visit to one of Michael's old clients.
Dwight becomes regional manager after Andy quits his job, Jim dedicates more time to his Dunder Mifflin job to save his marriage, and Angela has problems with her new living arrangements after her breakup with The Senator.
Livin' the Dream
Dwight prepares for a marriage proposal and hires an assistant for his assistant, Andy auditions for a singing program, Darryl tries to leave his job without a fuss, and Pam has second thoughts about Jim staying in Scranton.
One year later, Dunder Mifflin employees past and present reunite for a panel discussion about the documentary and to attend Dwight and Angela's wedding.