Toby leaves Dunder Mifflin, and Michael plans a huge goodbye party... out of joy. Angela refuses to help with it, so Michael turns to Phyllis. Dwight and Meredith harass Holly, their new HR representative.

Michael tries to motivate the Scranton branch to lose weight as part of an interoffice competition. Jim is lost after Pam leaves for art school in New York, and Angela continues to see Dwight even though she is now engaged to Andy.

Holly leads a business ethics seminar as a result of Ryan's scandal, and when Michael encourages everyone to share their own unethical work behaviors, things get out of hand. Meanwhile, Jim messes with Dwight by requiring him to follow the Dunder Mifflin "Time Theft" policy.

Michael practices for the birth of Jan's baby by having Dwight go over possible birthing scenarios. Meanwhile, Michael tells Holly that he will pretend to dislike her for Jan's benefit.

Michael and Holly have sex for the first time, and Michael holds a fund-raiser for the office after it is burglarized. Dwight confides in Phyllis after Andy and Angela set a wedding date, and Jim runs into Pam's ex-fiancé Roy.

Pam is embarrassed when she is the only person at corporate wearing a costume on Halloween. Holly and Michael take the long trip to Nashua after they get some shocking news from corporate. Meanwhile, Dwight torments Andy and tries to get under his skin.

At the company picnic, Michael and Holly are reunited for the first time since their split. The rest of the staff competes in games, such as the volleyball tournament.

Michael, believing he has herpes, contacts all his ex-girlfriends, including Jan and Holly. Andy tries to play on Erin’s compassionate side by holding a sex education meeting for the office.

Michael could not be happier when Toby has to take a leave of absence and corporate sends Holly Flax to cover for him. Pam is forced to do a second Christmas party after Michael wants the party to be on the day Holly returns to Scranton. Meanwhile, Jim regrets agreeing to a snowball fight with Dwight.

Michael prepares himself for the good or bad news about Holly and her boyfriend. In an effort to be an "awesome" office manager, Pam decides to put up a resolution board for everyone to post their New Year's resolutions.

Holly and Michael turn Andy's business seminar into an improv challenge. Erin and Gabe compete in a board game battle.

An emergency call from Helene forces Jim to abandon Michael at a gas station restroom, and Holly, Erin, and Dwight set out to rescue him. Gabe becomes offended at submissions to caption Pam's latest work of art.

The staff grows increasingly uncomfortable with Michael and Holly's PDAs. Jim and Pam regret a champagne luncheon. Andy horns in on a romantic treasure hunt Gabe arranged for Erin.

Michael screens his action film Threat Level Midnight to the office after eleven years of writing, shooting, re-shooting, and editing. The film features Michael as Agent Michael Scarn, Dwight as Scarn's sidekick, and Jim as archnemesis "Goldenface," as well as several people from Michael's past.

Traveling salesman Todd Packer comes to Dunder Mifflin looking for a desk job in the office. However, the office is unsure if they want him to work there due to his previous behavior. After dealing with computer problems, Andy confronts office administrator Pam to get a new computer.

The office holds a garage sale in the warehouse. Michael decides to propose to Holly, and runs into trouble thinking of how to do it well.

Michael wants to have a drama-free day at work on his last day before moving to Colorado. Meanwhile, Deangelo Vickers and Andy Bernard scramble to retain Michael's biggest clients.