Marshall warns Barney that the third slap in their slap bet will be coming on Thanksgiving night.
Thanksgiving with Marshall's family is stressful when Lily thinks she might be pregnant. Robin, Barney, Ted spend the holiday volunteering.
After Winston graduates from the Police Academy, Nick and Coach worry when they see his new training officer. Meanwhile, Jess uses Schmidt to try and influence a councilwoman to stop the night construction taking place outside the loft.
The BAU searches inside a New Mexico community for a killer targeting women and Hotchner looks to an FBI cadet with a unique past for help.
As Ted settles into living alone, Barney tries to get him to hit the town every night; Lily has an erotic dream; Robin becomes famous.