Andy returns from a "leadership retreat" with newfound confidence in his management abilities, which leads to an HR disagreement with Toby. Meanwhile, Jim and Dwight feel old when two new employees arrive that remind the other office workers of a younger Jim and Dwight.
Roy's surprise performance for Lara at their wedding instigates Jim and Pam to find out something new about each other. After Nellie forces Dwight to support a charity, he chooses a charity that supports an inhumane group.
Andy brags about his discovery that he's related to First Lady Michelle Obama. Darryl finds his new job as Assistant Regional Manager difficult. Nellie tells Pam that Jim may be having an affair, while Jim reveals to Darryl his plans of moving to Philadelphia.
When Jim convinces Dwight the building is unsafe due to a radiation leak, Dwight rents a bus and sets up the office inside. Meanwhile, Nellie asks Andy for a letter of recommendation in order to adopt a baby and Erin gives her tips on how to fill out the application.
When Jim's partners invest some of their own money for the new business venture, Jim feels obligated and convinces Pam pitch in some of their own money as well. Meanwhile, Andy brings in his a cappella band from his college to perform at the office Halloween party.
Andy must help his family when his dad loses all of their money. Meanwhile, Dwight is a guest on a radio show, and his co-workers call in to bother him. Kevin learns a secret about Oscar, and Andy's brother Walter Jr., who is now a drunk, returns.
Dwight is tasked with selling paper to an unknown woman, revealed to be Jan Levenson from the Scranton White Pages. Angela fears her husband is cheating on her and enlists Oscar to help her spy on him at yoga class. Meanwhile, Andy skypes into the office from his boat.
Angela goes to Dwight for help when she learns that her husband is having an affair with Oscar. Meanwhile, Stanley Hudson and Phyllis Vance take advantage of Jim when he needs a favour, and Pete distracts Pam as she begins painting her mural.
When the party planning committee forgets to plan the annual Christmas party, Dwight gets everyone to celebrate with a traditional Schrute German Christmas. Meanwhile, Darryl fears Jim has forgotten to include him in the new job in Philadelphia.
Pam accidentally brings lice into the office but lets Meredith Palmer take the fall while Dwight vows to destroy the parasites. Jim spends a great day in Philadelphia with a potential business associate, while Nellie, Phyllis and Kevin interfere with Darryl's love life.
Clark returns and Dwight enlists his help posing as father and son so they can successfully sell to the owner of a suit warehouse. Darryl travels to Philadelphia with Pam to interview at Jim's new company and, after a mixed interview, Darryl gets the job.
After discovering that Darryl works for Jim's new company, Dwight concocts creative plans to keep Darryl with Dunder Mifflin. Nellie recruits Pete and Erin to head Dunder Mifflin's social media presence, and accidentally rekindles their flirty relationship.
Dunder Mifflin CEO David Wallace tasks Dwight with finding a part-time replacement for Jim. Dwight in turns enlists several of his close friends, including his cousin Mose. Pam meanwhile tries to find out who her new desk mate will be.
Someone vandalises Pam's warehouse mural. Distraught, she seeks the help of Dwight and Nellie who both eagerly help her track down the vandal. Meanwhile, in their Philadelphia apartment, Darryl is uncomfortable with Jim's uncleanliness.
The office pairs into couples so they can all take advantage of a mini-mall's Valentine's Day discount. Erin decides she's going to break-up with Andy after he returns from his boat trip so she can be with Pete, but Pete begins to doubt she'll follow through.
Pam interviews for a job in Philadelphia, but her potential manager reminds her of her former boss, Michael Scott. Dwight acquires the help of Angela in order to give his elderly Aunt Shirley a bath. Meanwhile, Andy attempts to make Pete and Erin feel uncomfortable.
After Andy discovers Erin and Pete are a couple, he hires their exes to create drama. Pam interviews at a Philly real estate firm, which has similar office antics to Dunder Mifflin. Jim makes his new job a priority and keeps canceling plans with Pam.
Dwight and the Schrute family gather for Aunt Shirley's funeral, and learn that she has left the farm to Dwight and his siblings. Dwight then tries to convince his brother, Jeb, and sister, Fannie, to stay and help run the farm.
A promo for the documentary comes out and everyone realises their secrets will be revealed. Meanwhile, Dwight and Clark negotiate with a farmer over tractors, although they are worried that the farmer's hot daughters are trying to trick them into a bad deal.
Dwight takes extreme measures to get a reluctant Stanley to go to a client meeting. Meanwhile, the Senator publicly addresses his sexuality at a press conference in advance of the documentary's premiere.
Dwight and Angela participate in a paper airplane contest, competing against one another. Meanwhile, Andy prepares for a potential acting job, and Jim and Pam utilise new skills they learned in couples counselling.
Andy decides to pursue fame in a memorable fashion. Meanwhile, Dwight's dreams comes true in the form of a black belt and a promotion, and Jim and Pam are back together permanently in Scranton.
Jim thinks of an office contest to find the best "Assistant Assistant to the Regional Manager". Angela brings Phillip to work after getting banned from day care, and Andy anxiously waits in line for his audition for "America's Next A Cappella Sensation".
The cast of the documentary has returned to Scranton to do a "Where Are They Now?" panel on the same weekend as Dwight and Angela's wedding. Former and past Dunder Mifflin employees reunite and reminisce on the years during filming as well as the time spent since.