Hen fears for Karen’s life when an explosion rocks her science lab on the day she brings Denny to work with her.

Without telling Emily or her parents anything, Bill decides with Zoe to test on Emily the biological weapon he hopes to be able to use against the aliens. Catherine, for her part, has had difficulty managing her grief since Mokrani's death. She now has only one thing on her mind: to find out who Bill Ward is and find him. Sophia is ready to help him, but Nathan hesitates.

Far out! Korvo and Terry manipulate each other with time travel while Yumyulack grows a fat hog.

Woohoo! School's out, so the Solars make a splash at summer camp!

Korvo tries to get the family involved in repairing the spaceship, but they attend a birthday party instead, where he is inspired to become a magician. Using his computer system Aisha, Korvo creates a technologically advanced magic act; he goes viral and prepares for a Las Vegas show, which will culminate in him leaping through a black hole. Korvo ignores his family's warning that jealous magicians plan to kill him; the family save him from being shot, but he dies when the black hole trick goes awry. The grieving family agree to repair the ship in Korvo's memory, and he reappears, having faked his death to bring them closer together. Yumyulack adds a woman named Cherie to his shrunken collection.

Young M.O.D.O.K. has kidnapped the family and replaced them with robots that trick M.O.D.O.K. into thinking Jodie wants him back. M.O.D.O.K. learns the truth and goes to free his real family. The family meet up inside the carnival-themed arena Murderworld, where young M.O.D.O.K. and Arcade reveal that each family member has two robotic replicas and that they must fight to the death, unsure of who is real or fake. Jodie goes toe-to-toe with Young M.O.D.O.K. The family leaves feeling united for the first time in a while.

Without telling Emily or her parents anything, Bill decides with Zoe to test on Emily the biological weapon he hopes to be able to use against the aliens. Catherine, for her part, has had difficulty managing her grief since Mokrani's death. She now has only one thing on her mind: to find out who Bill Ward is and find him. Sophia is ready to help him, but Nathan hesitates.

Catherine, Sophia and Nathan make their way to London, accompanied by Victor, a survivor encountered by chance. Along the way, the dangers multiply. Sacha's feelings towards Emily intensify and the young man's behavior becomes more and more disturbing. Feeling threatened, Bill is forced to flee.

When a BAU member gets in trouble in Mexico, the team enlists the services of the International Response Team for their help.

Athena investigates when the same house is hit with two home invasion 9-1-1 calls within hours of each other; The 118 race to the rescue when a D-I-Y home renovation traps a man in an attic; Hen asks for a second chance with her medical school professor; Maddie and Chimney regret hiring a nanny for Jee-Yun after the woman completely takes over their apartment.

The BAU investigates the cause of several fatal car crashes involving drivers and pedestrians. Also, Reid gets bad news.

When human remains are discovered in the world's largest chocolate bar, a 'sweet' event for a candymaker quickly turns bitter.

When Beckett's life is suddenly put in danger, the team searches for a way to save her while Castle keeps her distracted by arguing with her about who fell for whom first.

When Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands.

When Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands.

When a BAU member gets in trouble in Mexico, the team enlists the services of the International Response Team for their help.

The BAU investigates the cause of several fatal car crashes involving drivers and pedestrians. Also, Reid gets bad news.

Harrow proves a suburban suicide is in fact murder, uncovering one family's secrets as he is forced to hide his own.

When Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands.

Hen fears for Karen’s life when an explosion rocks her science lab on the day she brings Denny to work with her.

Last season ended with Beckett wrestling over whether to take a high-profile job in DC - a dilemma made more complicated when Castle proposed to her. Now Castle and Beckett will deal with the consequences of their decisions.

Booth and Brennan's next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck.

Continuing from the season premiere episode, Beckett races against time to find a stolen toxin capable of killing tens of thousands of people. To make matters worse, Castle was exposed, leaving him with less than 24 hours to live.

The BAU investigates when several young men and women are victims of disfiguring acid attacks. Also, Dr. Reid begins to settle into his new surroundings.

A mother steps forward with valuable information for the BAU to aid in their investigation of an unsub known as the bone crusher. Also, Reid must adapt to a new set of rules in prison life.

Harrow is reminded why he hates camping on a hiking trip with Fairley and Nichols, but things turn strange when the trio find themselves conducting an impromptu murder investigation and a life-or-death battle.

When Reid and Garcia are abducted by Benjamin Merva, it's up to the rest of the team to find them. The BAU finds surprising clues in their own history to solve why the two heroes have been targeted by a mass murderer. It's a race to save them before a "Believers" prophecy is fulfilled.

While searching for missing campers, Colter meets a retired police officer who believes a serial killer is on the loose.

Last season ended with Beckett wrestling over whether to take a high-profile job in DC - a dilemma made more complicated when Castle proposed to her. Now Castle and Beckett will deal with the consequences of their decisions.

Harrow is reminded why he hates camping on a hiking trip with Fairley and Nichols, but things turn strange when the trio find themselves conducting an impromptu murder investigation and a life-or-death battle.

Booth and Brennan's next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck.

The body of a brilliant and career-driven surgeon is found in a rough neighborhood with multiple fractures in her skull and no indication as to how or why she was there.

The BAU believes two unsubs may be operating at the same time, when victims killed in two drastically different ways are discovered in the same city. Also, the team grapples with keeping Reid safe in prison.

Athena and the 118 race to the rescue when a fading movie star is plagued by a series of near death experiences.

A desperate young murder suspect, Emma Briggs, takes hostages at gunpoint then mysteriously insists that she will only negotiate with one person: Richard Castle.

The BAU investigates an urban vampire in New York who kidnaps his victims at night and holds them underground in the sewer system. Also, Reid makes an impossible decision in prison that severely affects himself and other inmates.