Leslie (Amy Poehler) and Ben (Adam Scott) both face new challenges on the first day of new jobs. Donna (Retta), April (Aubrey Plaza) and Andy (Chris Pratt) play a prank on Ben, while Tom (Aziz Ansari) prepares for a big presentation. Meanwhile Ann (Rashida Jones) and Chris (Rob Lowe) contemplate taking a big leap together.
Sue sells sausage and cheese samples for the school. All her efforts go in vain as the school fails to see this. Frankie demands her daughter fights for her rights. Meanwhile, Brick discovers love with his current girlfriend a little stressful as she bosses him about.
Larry commits a faux pas with Sammi's fiance, and tries to start over with his mail carrier and golf club security guard.
Ted finally meets his mystery girl in the Slutty Pumpkin costume. Meanwhile, Barney learns he is part Canadian, and Lily has pregnancy brain. Katie Holmes guest stars as Naomi, the Slutty Pumpkin.
The BAU travels to Albuquerque to investigate the case of a serial killer who impregnates young women and murders them after they have given birth.