Jim and Pam are stunned to discover Michael is dating her mother. Dwight bugs Jim’s office under the guise of a gift.
Dwight and Andy believe an insurance saleman calling on Michael is a Mafioso. Kevin inadvertently ruins Jim and Pam’s honeymoon.
The Dunder Mifflin staff head to Niagara Falls for Jim and Pam’s wedding, with the understanding that her pregnancy is a forbidden discussion topic, but Jim’s slip of the tongue prods Michael to attempt damage control.
Pam is forced to deal with Andy’s scrotal injury on her wedding night, while Kevin deals with the loss of his dress shoes on the morning of Jim and Pam’s wedding.
Jim quickly learns the downside of management after he informs the staff that there’s not enough money for everyone to get a COLA raise, including Dwight trying to rally everyone against him. Pam pushes for cash instead of traditional wedding gifts.
Michael gets worried after David Wallace and Jim have a private meeting. Pam tries to get a headcount for the wedding. Darryl’s worker’s compensation claim makes Dwight suspicious.
After Michael learns from Stanley that the rumor he spread about him having an affair is based on fact, he makes up rumors about everyone else, hoping they’ll all be uncovered and disbelieved, but accidentally concocting a rumor that’s actually true in the process.
Tree Hill bids goodbye to the past while anticipating the future: Lucas and Peyton prepare for the birth of their child with the help of a surprise visitor, Dan nears his end, and Brooke works with Victoria to relaunch Clothes Over Bro’s. Meanwhile, Nathan returns to Tree Hill to face Haley and Jamie after being released from the Chiefs.
Lucas and Peyton’s wedding day finally arrives, bringing some surprise guests along with it. Haley finds herself playing an unexpected role in the ceremony, as Skills and Brooke try to control Jamie and Nick. Meanwhile, Nathan continues to hope to be drafted into the NBA.
The families of Tree Hill draw closer as Lucas bonds with Jamie while working on Peyton’s car, Sam develops a connection with Victoria, and Brooke and Haley throw Peyton a baby shower. Meanwhile, Nathan’s ambitions seem closer than ever when he learns that an NBA scout will be watching his next game.
Nathan and Haley both face their dreams as he questions his ambition to play in the NBA and she receives an offer from Nick Lachey. Meanwhile, Brooke learns something that could change Sam’s life forever, Jamie attends his first school dance, and Lucas and Peyton take a road trip.