Katie strives to keep her long-separated parents apart when her father arrives in time to surprise the Otto family for Christmas. Anna-Kat does her best to help Trip win Taylor back but has a hard time getting past a very persistent Pierce. Meanwhile, Oliver thinks no one will remember him as the mask-wearing villain in the school's production of "The Nutcracker" but quickly takes center stage when a series of mishaps damages his costume.
Prentiss faces her past when the BAU is sent to investigate the murders of prominent businessmen, all of whom are missing their hearts. Also, Prentiss plans a romantic first date with Mendoza, but the evening is cut short by an urgent call from Rossi.
Hayley works to figure out the best time to give the family a Christmas gift they will never forget. Phil borrows the family Christmas tree for a house-showing. Jay, Gloria, and Joe deal with unwelcome holiday visitors.
Despite the chaos at the Amazon Fulfillment Center, the Bike Parade is still on. The boys’ chance of winning is in jeopardy when Kenny resists commercialism in solidarity with the striking workers.
Heahmund must try to convince King Alfred that his actions are in defense of the Crown. Ubbe and Torvi strengthen the position of the Vikings but not all in the Viking camp support their strategy. Another settler disappears in Iceland.