Tug Coker

It's Christmas time and both Marshall and Robin are feeling homesick in New York, and Ted's immature younger sister Heather arrives in the city. Ted has been trying to keep Heather and Barney apart because he fears they will sleep together. Barney and Heather prove Ted wrong and Ted is forced to admit that his sister has grown up.

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.

The Dunder Mifflin staff travel to Niagara Falls to celebrate Jim and Pam's wedding under strict orders not to mention Pam's pregnancy. Michael, Dwight, and Andy all want to hook up with guests at the wedding and Michael and Dwight meet twins.

The Dunder Mifflin staff travel to Niagara Falls to celebrate Jim and Pam's wedding under strict orders not to mention Pam's pregnancy. Michael, Dwight, and Andy all want to hook up with guests at the wedding and Michael and Dwight meet twins.

When the Jeffersonian team discovers remains of a victim, and elements of the crime scene point to a possible protege of serial killer Christopher Pelant, they must revisit their prior work on Pelant while tracing new clues that will hopefully lead them to the copycat killer. Meanwhile, Angela is skeptical about her and Hodgins decision to move to Paris and Brennan and Booth contemplate options outside of the Jeffersonian and FBI.