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.
Tree Hill is in an uproar as Nanny Carrie has finally gotten Haley where she wants her – unfortunately, that means both Haley and Jamie’s lives are in danger. Peyton feels threatened when Lucas must reunite with Lindsay for a business meeting. Meanwhile, Brooke’s struggle for control at Clothes Over Bros reaches the breaking point as Victoria continues to exert her power by making unexpected and unsettling business decisions.
Elliot begins enjoying luxuries since she has extra money with her new private practice gig. But eventually, J.D. becomes jealous of her and that forbids him the use of these privileges. Dr. Cox and the Janitor become roommates in one of the hospital suites, while Turk tries to convince Carla that she has postpartum depression and that she needs help.
Lex and Oliver Queen return to their old prep school for a reunion, but Oliver’s old friends (and Lex’s old enemies) start dying in mysterious accidents. Meanwhile, Clark learns that someone… or something may have left the Phantom Zone with him.