When three children disappear while riding their bikes on the same path as a similar unsolved disappearance 30 years ago, the BAU team comes in to investigate.

When a blimp suffers mechanical failure and its engine catches fire, Athena and the 118 must rescue victims both inside and outside a packed sports stadium. Bobby and Athena drop off May on her first day of college and discuss honeymoon plans, while Maddie and Chimney go to couple’s therapy.

A deadly face-off leads to a life-threatening moment; Catherine and Sam seek help for his parents.

Bill's latest discovery is put in jeopardy, even as trouble brews with the human aliens; Catherine must decide where her loyalties lie.

In a bid to save his marriage, M.O.D.O.K. takes Jodie back in time to a concert they missed when they were in college. During a detour to kill the child-version of his GRUMBL boss, M.O.D.O.K. and Jodie are attacked by college-aged M.O.D.O.K., who accidentally absorbs their time crystals, stranding them in 2002. The couple reconciles but is stuck in the past until they catch up to the present. Once in the present, they prevent themselves from ever going to the past in the first place, erasing their entire adventure from the timeline.

A deadly face-off leads to a life-threatening moment; Catherine and Sam seek help for his parents.

Bill's latest discovery is put in jeopardy, even as trouble brews with the human aliens; Catherine must decide where her loyalties lie.

The BAU welcomes back Emily Prentiss as they are called upon to investigate the disappearance of three women.

Castle and Beckett take on a murder at a sci-fi convention.

The BAU team searches for a serial killer along the Appalachian Trail in rural Virginia.

When a bearded, rotund man in a red Santa suit with an ID reading Kris Kringle falls from the sky in Central Park, Castle and Beckett are on the hunt to find the person who killed Santa.

Castle and Beckett enter the world of adult entertainment when the founder of college girls gone crazy is murdered.

Owen helps T.K. reconcile the past to help his future; Judd and Grace aid Judd's aging father; Michelle learns the full truth about her missing sister, Iris.

When the remains of a couple are discovered in a cave at National Park, the team must piece together the identity of the man and the woman as well as solve the crime; and Booth's girlfriend and Afghanistan-war correspondent Hannah Burley makes a surprise visit, causing Brennan to re-evaluate her own relationship with Booth.

The BAU welcomes back Emily Prentiss as they are called upon to investigate the disappearance of three women.

The BAU team searches for a serial killer along the Appalachian Trail in rural Virginia.

While Grace autopsies the body of an elderly man discovered in an Egyptian sarcophagus, Harrow finds himself in a battle for his own life.

Castle & Beckett get an up-close-and-personal view of a 'Real Housewives'-esque reality TV series, 'The Wives of Wall Street', when they investigate the murder of the show's rising young star.

When a blimp suffers mechanical failure and its engine catches fire, Athena and the 118 must rescue victims both inside and outside a packed sports stadium. Bobby and Athena drop off May on her first day of college and discuss honeymoon plans, while Maddie and Chimney go to couple’s therapy.

In the first of a two-episode story arc, Castle & Beckett begin a murder investigation that also exposes a plot to kidnap the daughter of a wealthy Middle Eastern businessman.

Booth and Brennan are called to investigate decomposed remains found at the Jersey Shore. The team grows fond of Booth's girlfriend, Hannah, and Angela tries to keep her pregnancy a secret.

In the powerful conclusion of a two-episode story arc, when the FBI fails to get his daughter back, Castle takes matters into his own hands, reaching out to a shadowy fixer to help him recover Alexis.

The BAU investigates if bullying may be the link between two high school students who are the sole survivors after both of their families are killed.

When three children disappear while riding their bikes on the same path as a similar unsolved disappearance 30 years ago, the BAU team comes in to investigate.

Harrow is desperate to prove once and for all that Francis Chester is alive and trying to kill him, but with no proof, even his most-trusted friends and colleagues doubt Harrow's state of mind.

After The Disciple comes after two members of the team, the BAU races to help them.

Colter takes a job locating a missing teen with a unique spiritual gift in an inhospitable mining town

In the first of a two-episode story arc, Castle & Beckett begin a murder investigation that also exposes a plot to kidnap the daughter of a wealthy Middle Eastern businessman.

Harrow is desperate to prove once and for all that Francis Chester is alive and trying to kill him, but with no proof, even his most-trusted friends and colleagues doubt Harrow's state of mind.

A skull and decomposing hands are found in a dumpster, and the victim turns out to be a bounty hunter in search of Charles Braverman, a man indicted for the murder of a co-worker; meanwhile, Brennan is asked by Professor Bunsen Jude, "The Science Dude," if he can shoot an episode of his children's show from the Jeffersonian, with Brennan as his special guest.

Brother arrives in town, knowing everything about her and her family, and she is unable to make contact with her real sibling.

The 118 race to the rescue when a structure collapse at a “happiness convention” traps people under rubble. While on FaceTime with her mom, Athena’s father suffers a stroke and crashes through the wall of his house. Hen stretches herself too thin with test prep and her new responsibilities at the 118, while Maddie tries to help new recruit get his bearings at the call center.

When a man is found dead in an industrial cake mixer, Castle and Beckett trace the murder to an Irish gang in Staten Island and a beautiful bar owner named Siobhan O'Doul.