Episode Guide

601: The Longest Night, Pt. 2 TV-14 (60 min)

The BAU team closes in on the serial killer as he continues his murder spree throughout Los Angeles ” with "Detective Spicer's kidnapped daughter as his hostage. Tim Curry ("The Rocky Horror Picture Show") returns as serial killer "Billy Flynn and Robert Davi ("Profiler") reprises his role as "Detective Adam Kurzbard.

602: "jj" TV-14+DLV (60 min)

While "JJ attempts to reunite a family whose daughter has mysteriously disappeared, her BAU family braces for the loss of one of their own. Gil Bellows ("Ally McBeal") and his real-life wife, Rya Kihlstedt, guest star as "Jeff and Patty Joyce, the distraught parents of the missing girl.

603: Remembrance Of Things Past TV-14+DLV (60 min)

When several women are found murdered in a similar fashion, Rossi revisits a cold case that has haunted him for 25 years, causing him to suspect that the original killer is at work again. Guest stars include Daniel J. Travanti as Mr. Mullens, the original unsub that Rossi hunted in the first string of killings years ago, who now suffers from Alzheimer's Disease.

604: Compromising Positions TV-14+DLSV (60 min)

The BAU team searches for a serial killer who is preying on married couples. Also, "Hotchner looks to one of the team to fill "JJ's vacant role.

605: Safe Haven TV-14+LV (60 min)

The BAU team is on the trail of a serial killer targeting families throughout the Midwest. Meanwhile, Morgan is concerned when Ellie runs away from her foster family and pays him a visit. Emmy Award winner Mare Winningham ("Hill Street Blues") guest stars as "Nancy Riverton, a mother who takes the possible suspect into her home, and Isabella Murad returns as "Ellie Spicer, "Detective Spicer's daughter.

606: Devil's Night TV-14+LV (60 min)

The BAU team must find a killer who has struck Detroit for the past three years solely during the raucous pre-Halloween celebration "Devil's Night." Guest stars include Ernie Hudson ("Oz") as Detroit Police "Lieutenant Al Garner; Leonard Roberts ("Heroes," "Drumline") as "Kaman, a suspect in the Devil's Night slayings; Carl Lumbly ("Alias," "Justice League") as diner owner "Jay-Mo; and Michael Warren ("Hill Street Blues") as "Tom, another potential victim.

607: Middle Man TV-14+LSV (60 min)

The BAU must catch a group of serial killers that is killing exotic dancers and leaving their bodies in the cornfields of Indiana.

608: Reflection Of Desire TV-14+LV (60 min)

When a kidnapped woman is found murdered in an alley in Georgetown, the BAU team goes on the hunt for the killer before he can strike again. Guest stars include Academy Award Nominee Sally Kirkland ("Anna," "JFK") as 1950s film actress "May, and Robert Knepper ("Heroes," "Prison Break") as her devoted son, "Rhett.

609: Into The Woods TV-14+LV (60 min)

When an 8-year-old is found murdered on the Appalachian Trail, the BAU team goes deep into its forests in search of a man lurking in the wilderness who is targeting children.

610: What Happens At Home TV-14+LV (60 min)

The BAU searches inside a gated New Mexico community for a killer targeting women, and "Hotchner looks to an FBI cadet with a unique past for help with the investigation. Rachel Nichols ("Star Trek," "Alias") guest stars as "Agent Ashley Seaver, an FBI cadet with a troubled past who assists with the case.

611: 25 To Life TV-14+LV (60 min)

"Morgan suggests that a man has been rehabilitated and aids in his parole, but later regrets his decision when the man murders someone days after being released. Rachel Nichols ("Star Trek," "Alias") returns as "Agent Ashley Seaver. Guest stars include Kyle Secor ("Homicide: Life on the Street") as recently paroled "Don Sanderson and Philip Casnoff ("Sinatra," "Strong Medicine") as "Congressman James Stanworth.

612: Corazon TV-14+LV (60 min)

As the BAU travels to Miami to investigate a series of bizarre, ritualistic murders, "Reid: suffers a series of blinding headaches and hallucinations that leave him concerned for his health. Rachel Nichols ("Star Trek," "Alias") returns as "Agent Ashley Seaver.

613: The Thirteenth Step TV-14+DLSV (60 min)

The BAU hits the road to track down a pair of young lovers on an interstate murder spree. Also, "Prentiss hears frightening news from her former boss at Interpol. Guest Stars include Adrienne Palicki ("Friday Night Lights," "Lone Star") and Jonathan Tucker ("The Black Donnellys") as "Sydney and "Ray, the young lovers on the run; and Angus Macfayden ("Braveheart") as "Sean McAllister, Prentiss' former colleague.

614: Sense Memory TV-14+LV (60 min)

The BAU travels to Los Angeles to investigate unusual murders throughout the city. Also, more of "Prentiss' mysterious past comes to light. Guest stars include Brad William Henke ("Lost," "Dexter") as taxi driver "Steve;' Matthew Glave ("ER," "Army Wives") as "Detective Bailey, who assists the investigation; Stacey Oristano ("Friday Night Lights") as missing woman "Anisa Gold; and Timothy V. Murphy ("24") as "Ian Doyle, a person from Prentiss' past.

615: Today I Do TV-14+DLSV (60 min)

The BAU is called to upstate New York to investigate mysterious disappearances. Also, "Prentiss gets some disturbing news about one of her former Interpol colleagues. Guest stars include Rachel Miner as a missing person,"Molly; Corbin Bernsen as Molly's father, "Jerry; and Joshua Leonard as Molly's boyfriend, "Lyle.

616: Coda TV-PG+LV (60 min)

"Reid makes a connection with an autistic child that could assist the BAU in finding the boy's missing parents. Also, "Prentiss enlists two former Interpol colleagues in hunting an old nemesis. Guest Stars include Sebastian Roché ("General Hospital," "Fringe") as "Clyde Easter, one of Prentiss' former colleagues; Jessica Lundy ("Hope & Gloria") as missing parent "Alison Sparks; Mimi Kennedy ("Dharma & Greg," "Homefront") as teacher "Miss Rogers; and Romy Rosemont ("Glee," "CSI: Crime Scene Investigation") as "Lizzie Sparks, the young boy's estranged aunt.

617: Valhalla TV-14+LV (60 min)

After a series of suspicious murders occur, Prentiss suspects her old Interpol nemesis, making her fear for the safety of her BAU team as he closes in on her. Sebastian Roché ("General Hospital," "Fringe") returns as "Clyde Easter, Prentiss' former Interpol colleague.

618: Lauren TV-14+DLV (60 min)

"Prentiss is ready to confront her nemesis, "Ian Doyle, once and for all. Meanwhile, the BAU calls upon "JJ to help them find "Prentiss and capture "Doyle before it's too late. Series star Matthew Gray Gubler directs the episode. A.J. Cook returns as Jennifer "JJ" Jareau.

619: With Friends Like These TV-14+LV (60 min)

When a gang of suspected murderers begins targeting a new victim each night, the BAU travels to Portland to head them off before they can strike again.

620: Hanley Waters TV-14+LV (60 min)

As the BAU investigates targeted killings in Tampa, they also deal with their own feelings about the loss of "Prentiss. Guest stars include Kelli Williams ("Lie to Me," "The Practice") as suspect "Shelley Chamberlain, and David Chisum ("One Life to Live") as her estranged husband, "Don.

621: The Stranger TV-14+LV (60 min)

The BAU hunts a stalker in San Diego who is targeting college students. Meanwhile, the team comes under Strauss' scrutiny in the wake of the loss of "Prentiss. Indianapolis Colts tight end Dallas Clark guest stars as San Diego Police Officer "Austin Kent, who assists the BAU with the investigation.

622: Out Of The Light TV-14+LV (60 min)

The BAU is called to a North Carolina mountain town after a woman is found badly injured and another is missing, and they discover that these two are not the only victims. Jeff Meek ("As the World Turns") guest stars as suspect "Robert Bremmer.

623: Big Sea TV-14+LV (60 min)

The BAU is Florida-bound to investigate bodies discovered buried in the ocean floor off Jacksonville, but the case rattles "Morgan when his aunt suspects that her missing daughter is one of the victims. Denise Dowse ("The Guardian," "Beverly Hills, 90210") guest stars as Morgan's aunt, "Yvonne Burns.

624: Supply And Demand TV-14+LV (60 min)

The bodies of two missing persons are found in a car trunk, and the BAU suspects that an interstate human trafficking ring is at work. Also, "Hotch warns the team of possible changes, and they are surprised when a beloved team member returns. A.J. Cook returns as Jennifer "JJ" Jareau. Nicholas Brendon ("Buffy the Vampire Slayer") returns as Garcia's boyfriend, "Kevin Lynch. Amy Price-Francis ("24") guest stars as "SSA Andi Swan, head of the Domestic Trafficking Task Force, who assists the BAU on the case.