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.
Brooke heads to New York to confront Victoria while Peyton forges a connection with famous musician Mick Wolf, who tells her stories about her parents. Meanwhile, Haley’s problems with a student escalate, and Nathan has a strange vision of Quentin.
Dr. Cox feels like the TV character House when he has to solve several mysteries, one of them being Elliot’s anger towards Dr. Kelso, while for some reason she is taking it out on Turk. J.D. tries to be a better boyfriend to Kim.
The mysterious Green Arrow steals a necklace from Martha, and both Lois and Clark resolve to find out who the vigilante is. While Clark determines Green Arrow’s true identity, Lex continues his investigation of the mysterious black box while Lionel warns Lana against him.