Criminal Minds season 8

When an ambulance transporting an Abilene, Texas inmate crashes and three men are found dead inside the vehicle, including a prison guard with his mouth sewn shut, the BAU works with the U.S. Marshals Service to determine whether or not a still unidentified serial killer known as "The Silencer", who murdered three women in a similar manner eight years earlier, has resurfaced. Meanwhile, with Prentiss accepting a leadership position at Interpol, the team welcomes their newest member, linguistics expert Alex Blake (Jeanne Tripplehorn), into the fold.

When two Southern California residents — a San Diego woman and a Los Angeles man — are killed within hours of each other, the BAU suspects two vigilantes are working in concert to deliver their own brand of justice against paroled criminals. Meanwhile, Rossi comes up with a unique way to spend his accumulating vacation days without taking any time off.

When three members of a missing Kansas City, Kansas family of four are found shot to death in an alleged murder-suicide, with one of the two children still missing, and another family of four subsequently disappears from Lenexa, the BAU sets out to track down a family annihilator who stalks his victims and forces them to confess their wrongdoings to each other. Meanwhile, Hotch receives surprising news that threatens to test his relationship with Beth.

When a legless corpse is found in Juárez, Mexico and a man wakes up in a New Mexico motel with his right foot removed, the BAU sets out to profile an unqualified surgeon (Ray Wise) who thinks he can defy human biology. Meanwhile, Reid's secret phone conversations with a mysterious woman (Beth Riesgraf) leave the rest of the team intrigued.

When four La Grande, Oregon men disappear and a puddle of vomit found at the scene of the latest victim's last-known sighting reveals he had elevated levels of melatonin in his system, the BAU attempts to find a common link between the victims. Meanwhile, JJ grows worried after learning Henry is adamant about not celebrating Halloween.

When a Miami, Florida prostitute is murdered in a manner similar to a recent series of dog killings, the BAU sets out to profile an escalating duo consisting of a middle-aged, experienced criminal and an aspiring teenage killer who idolizes him. Meanwhile, Morgan attempts to convince Reid to join the bureau softball team and Hotch receives an unnerving phone call.

When three people in Santa Monica, California are abducted, burned beyond recognition, and found near the city's famous pier, the BAU sets out to catch a mission-oriented killer who views his victims as viruses to the community. Meanwhile, Rossi reflects on his days as a Marine fighting in the Vietnam War when he unexpectedly reunites with his former sergeant (Meshach Taylor).

When a school bus transporting 24 Fredericksburg, Virginia high school students disappears, the BAU determines the crime was committed by two brothers with an extreme gaming addiction, who are looking to replicate their favorite violent video game.

When two Seattle, Washington residents are stabbed to death in their homes, the BAU suspects a popular motivational speaker is behind the murders. Meanwhile, Garcia becomes concerned when Morgan declines an invitation to give a speech honoring an old family friend at a gala hosted by the British Embassy.

When two Winslow, Arizona men are found dead in coffin-like boxes with marked changes in their appearances and the second victim's girlfriend is reported missing, the BAU sets out to track down a "collector"-type killer (Brad Dourif) with an unusual obsession. Meanwhile, Reid grows increasingly anxious after his mystery woman, Maeve, proposes a face-to-face meeting.

When a Gulfport, Mississippi man and a Citronelle, Alabama woman are hammered to death through a chisel in the back of the head, the BAU launches an intense manhunt for a killer whose signature matches that of another who murdered eight prostitutes over a 20-year period. Meanwhile, Hotch realizes that someone is deliberately replicating crimes the team recently solved.

When Reid receives a cryptic phone call that leads him to conclude Maeve's stalker has abducted her, the BAU juggles tracking down Maeve and her kidnapper and preventing one of their own from suffering a mental breakdown.

With Reid taking time off to seclude himself in the wake of Maeve's death, the remaining members of the BAU travel to San Francisco, California to investigate the murders of two people who were both exsanguinated and wrapped in plastic postmortem.

When two teenage Salisbury, Maryland sisters are reported missing on the anniversary of their mother's mysterious disappearance, the BAU juggles tracking down the girls and determining whether or not their father is a suspect in both cases.

When three Austin, Texas residents are savagely beaten to death and found with watches set to a specific time, the BAU attempts to profile a killer suffering from a severe identity crisis.

When two Philadelphia, Pennsylvania women are found exsanguinated with their eyelids removed, the BAU suspects the crimes were committed by "The Replicator" and sets out to prevent him from striking again. Meanwhile, Blake struggles with her personal demons after Strauss asks to make amends for her past actions.

With the Replicator case declared inactive, the BAU travels to Saint Paul, Minnesota to investigate the murders of two women, who both had their tongues removed, and track down a serial killer targeting women who document their personal lives and inner fantasies on social media sites. Meanwhile, Garcia suspects Kevin is jealous of her new love interest after introducing them to each other.

When two Chicago, Illinois men are found beaten to death with their pants pulled down to their legs, the BAU attempts to identify a spree killer who sees his victims as child molestors. Meanwhile, Morgan becomes personally involved in the case after a major revelation forces him to confront his childhood abuser.

When a severed head is discovered in a Colorado time capsule that was buried 25 years earlier and a local retired police officer's decapitated corpse is subsequently found, the BAU juggles delving into the victims' personal lives and profiling an escalating vigilante who perceives his victims as hypocrites.

When two South Dakota men are poisoned, dismembered, and found with ritualistic markings on their bodies, the BAU determines the crimes were committed by a Rapid City hotel owner who suffered a devastating loss. Meanwhile, Reid works with Rossi to determine the cause of his recent bouts of insomnia.

When a California serial killer, who annually abducts nannies and the children they watch on the same day, strikes earlier than usual in Los Angeles, the BAU juggles tracking down the current missing nanny and the two-year-old girl she was hired to watch and convincing the only known survivor to help them identify the killer.

When two Detroit, Michigan couples are found stabbed to death in their car trunks, the BAU sets out to catch a proxy killer who forces his victims to kill each other for him to fulfill a twisted need. Meanwhile, Blake contemplates her future with the team after her husband, James (D.W. Moffett), returns from overseas with a potentially life-changing proposition.

While vacationing in New York City with Beth and Jack, Hotch receives a phone call from his younger brother, Sean (Eric Johnson), who says that a woman died of an ecstasy overdose at a bar Sean works at. When Hotch learns that four other people in the city, including Sean's girlfriend, died of similar causes over the last week, the BAU attempts to profile a sociopathic poisoner attempting to make a statement. Meanwhile, Hotch struggles to keep himself from becoming emotionally involved in the case.

After "The Replicator" (Mark Hamill) hacks into Garcia's computer system, kills Strauss by breaking into her hotel room and forcing her to drink ecstasy-laced wine at gunpoint, and leaves Hotch a taunting message, the BAU is given 24 hours to identify the motive behind the stalker-turned-serial killer's twisted spree and officially put an end to it.