K.C. invites Craig's father, Earl, over for the holidays, but it is discovered that they have been feuding with each other for quite a while because Earl is disappointed in Craig for not going to medical school and continuously brings up how he quit and gave up on that dream. Marissa later stops by and gives the Cooper family a gingerbread house, saying that her family really loves them; however, Ernie finds a card and finds out the Marissa lied. Eventually, Craig has enough and kicks Earl out of the house, but Ernie the airport's computers so Earl could not leave, forcing him and Craig to attempt to make up. Meanwhile, Ernie and Kira go off on a mission, but Kira ends up being captured. After Ernie calls for help and K.C., Craig, and Earl arrive, Craig orders Earl to remain in the car, but he later gets out and discovers that the Cooper family is spies. Craig and Earl later make up, but that doesn't last long after Kira sprays Earl with the memory spray.
