Jake, Charles and Gina are involved in a real-life “Die Hard” situation while off-duty on Christmas Eve, and Terry must leave his family celebration to try to save his squad. Meanwhile, Amy tries to prove she’s just as tough as Holt and Rosa.

When Peter’s couch is stolen from his front lawn, the guys form a neighborhood watch group. While on duty, Peter spots a man breaking into a house and mistakenly shoots Cleveland's son in self-defense.

Carrie follows a lead.

After they uncover a secret that could ruin Maria Ostrov’s reputation, Elizabeth and President Dalton head to Switzerland to meet with her and use the information as leverage to find a peaceful solution to the escalated conflict with Russia. Also, Dmitri requests to be released from his duties as a spy.

Cole and Luisa take a serious step forward. Meanwhile, a series of revelations cause Noah to reconsider everything he thought he knew about Alison - and a momentous decision Alison makes may just end their relationship.

A well respected surgeon is accused of plotting to commit a crime; Ruth suggests that Courtney Paige (Vanessa Williams) hire Jason for business in another state, hoping to remove him from Alicia's life.

The Clipping Book sends the team to a high-tech research facility, where the researchers have been turned into mindless monsters by some bizarre power source in the center's lab. When they disconnect the artifact, however, they find themselves stuck in a time loop.

Bart’s coming of age story a la “Boyhood” chronicles his life from six years old to his time as an accomplished young man. Along the way, his tense relationship with Homer, an overly uncaring version of himself, and Lisa, who overshadows him in every way possible, shape Bart more than he realizes.