As people across the globe are experiencing hallucinations, MI5 agent Zoe contacts Bill for answers; Catherine Durand detects unusual black hole activity.

As Adina starts the next stage of her plan, astronauts Juliet and Richard see warning signs in space; uncovering Adina's sinister mission.

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.

Korvo, increasingly frustrated by Terry, vomits a "red Goobler" – a stress-induced creature intent on killing Korvo. They buy a Jet Ski from Trent, who is killed by the Goobler. Hunting the creature inside a Halloween store, they shrink and capture it. At school, Jesse discovers a flower growing on her head, which releases pollen similar to MDMA, making the popular girls enamored with her. Yumyulack accompanies Jesse to a party and discovers his own flower, with pollen similar to cocaine, and bonds with the popular boys. The mix of Yumyulack and Jesse's pollen creates an effect similar to PCP or bath salts, turning the party-goers bloodthirsty and deranged. Jesse and Yumyulack inform Terry and Korvo, who explain the flowers are a temporary fungus.

Oh no! The Red Goobler's back and this time he's jacked! This one's too scary for me.

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.

Korvo, increasingly frustrated by Terry, vomits a "red Goobler" – a stress-induced creature intent on killing Korvo. They buy a Jet Ski from Trent, who is killed by the Goobler. Hunting the creature inside a Halloween store, they shrink and capture it. At school, Jesse discovers a flower growing on her head, which releases pollen similar to MDMA, making the popular girls enamored with her. Yumyulack accompanies Jesse to a party and discovers his own flower, with pollen similar to cocaine, and bonds with the popular boys. The mix of Yumyulack and Jesse's pollen creates an effect similar to PCP or bath salts, turning the party-goers bloodthirsty and deranged. Jesse and Yumyulack inform Terry and Korvo, who explain the flowers are a temporary fungus.

As people across the globe are experiencing hallucinations, MI5 agent Zoe contacts Bill for answers; Catherine Durand detects unusual black hole activity.

As Adina starts the next stage of her plan, astronauts Juliet and Richard see warning signs in space; uncovering Adina's sinister mission.

As Hotch fights for his life due to complications from his stabbing at the hands of George Foyet, a.k.a. “The Reaper,” he experiences visions of his late wife, Haley, and his nemesis, Foyet.

When the BAU investigates victims of possible ritualistic murders in Utah, clues lead them to believe that the UnSub they are looking for might have a fascination with the Salem Witch Trials.

When a toddler falls down a pipe and becomes trapped, the 118 must rely on more than their skills to rescue him; old wounds are opened when members of the 118 race to the aid of a man dealing with a divorce.

To deepen his connection with his late mother, Will joins Antonio in Puerto Rico; upon his return, he is quickly brought onto a case involving his uncle's old friend; Faith and Ormewood investigate the mysterious death of a sex offender.

Colter is hired to find a mother in Ohio who went missing after tucking her son in for the night.

When a toddler falls down a pipe and becomes trapped, the 118 must rely on more than their skills to rescue him; old wounds are opened when members of the 118 race to the aid of a man dealing with a divorce.

The son of a Russian diplomat is murdered; during the investigation, Castle entertains a jovial Russian security guard, who turns out to be more involved in the case than expected.

The team take a look into the death of a mini-golf superstar. Brennan is concerned about her dad.

Castle is abducted and forced to solve deranged puzzles and mind games with strangers; Beckett and the 12th precinct race to save Castle.

To deepen his connection with his late mother, Will joins Antonio in Puerto Rico; upon his return, he is quickly brought onto a case involving his uncle's old friend; Faith and Ormewood investigate the mysterious death of a sex offender.

Colter is hired to find a mother in Ohio who went missing after tucking her son in for the night.

When Athena is assigned a rookie to mentor, she begins to question her own abilities.

Booth and Brennan work cover as they become involved in the world of underground poker.

Beckett and the 12th Precinct look into the murder of an English as a Second Langue student. But when the victim's class won't talk to the police, Castle goes undercover as a French Canadian immigrant and learns that the victim was more than he seemed.

After a series of strangulations in Boston, the BAU looks for an UnSub who likes to keep mementos of the victims, and the team wonders if a common link to the casualties could lead them to the culprit.

Castle returns to the City of Angels in search of answers about his missing time. But things take a deadly turn when he's recruited by the legendary Greatest Detective Society to help solve a murder.

When teenagers who were reported missing are suspected of a series of mass murders in Chicago, the BAU investigates their whereabouts to find a motive for the crimes

Will, Faith and Angie find themselves embroiled in a series of cases where a similar marker links the murders of several sex offenders; Angie grapples with an unexpected proposition from Amanda.

Castle is abducted and forced to solve deranged puzzles and mind games with strangers; Beckett and the 12th precinct race to save Castle.

Castle returns to the City of Angels in search of answers about his missing time. But things take a deadly turn when he's recruited by the legendary Greatest Detective Society to help solve a murder.

Beckett and the 12th Precinct look into the murder of an English as a Second Langue student. But when the victim's class won't talk to the police, Castle goes undercover as a French Canadian immigrant and learns that the victim was more than he seemed.

After a series of strangulations in Boston, the BAU looks for an UnSub who likes to keep mementos of the victims, and the team wonders if a common link to the casualties could lead them to the culprit.

Castle returns to the City of Angels in search of answers about his missing time. But things take a deadly turn when he's recruited by the legendary Greatest Detective Society to help solve a murder.

When teenagers who were reported missing are suspected of a series of mass murders in Chicago, the BAU investigates their whereabouts to find a motive for the crimes

The team take a look at a local bakery after the body of an ex-con is discovered in pieces.

The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving UnSub, and the team speculates that Hotch is in the running to be the new BAU unit chief.

As the BAU zeroes in on the suspect of the ritualistic killings they’ve been investigating in Arizona, a bizarre connection within the UnSub’s family could lead them to finally nab the suspect.