Kirsten Vangsness as Special Agent Penelope Garcia (BAU Technical Analyst) vangsness is promoted to a series regular beginning with episode 14. this is the only season where a series regular is listed under also starring.
Lukas Haas appears in the first two episodes as The Footpath Killer.
In the pilot episode, "Extreme Aggressor", Andrew Jackson guest-starred as Timothy Vogel. Chelah Horsdal guest-starred as his victim, Heather Woodland. In the episode "Won't Get Fooled Again", Tim Kelleher guest-starred as Adrian Bale, a serial bomber responsible for the deaths of six FBI agents. In the episode "Plain Sight", Kirk B. R. Woller guest-starred as serial rapist Franklin Graney. In the episode "Broken Mirror", Matt Letscher guest-starred as Vincent Shyer, an erotomaniacal stalker who abducts one of the twin daughters of Executive Assistant District Attorney Evan Davenport, played by Robin Thomas. Elisabeth Harnois guest-starred in a dual role as Davenport's daughters, Patricia and Cheryl.
In the episode "L.D.S.K.", Marcus Giamatti guest-starred as Barry Landman, a narcissistic trauma surgeon suspected of committing several shootings. Paula Newsome portrays Detective Shea Calvin, who leads the investigation of the shootings. In the episode "The Fox", Neal Jones guest-starred as one of the series' most notorious criminals, Karl Arnold, aka "The Fox", a serial killer who murders entire families. Tony Todd guest-starred as Eric Miller, a man who was wrongfully imprisoned for the murder of his family. In the episode "Natural Born Killer", Patrick Kilpatrick guest-starred as Vincent Perotta, a professional hitman who abducts FBI agent Josh Cramer of the Organized Crime Unit. Francesco Quinn guest-starred as Michael Russo, a mob boss who hires Perotta to abduct Cramer.
In the episode "Derailed", Chris Bauer guest-starred as Dr. Theodore Bryar, who has paranoid schizophrenia and held several passengers hostage, including Elle Greenaway, on a train. Jeff Kober guest-starred as Bryar's imaginary friend, Leo, and M. C. Gainey guest-starred as Detective Frank Moretti, who leads the investigation of the hostage situation. In the episode "The Popular Kids", Will Rothhaar guest-starred as Cory Bridges, a cult killer who murdered two high school students. In the episode "Blood Hungry", Kris Lemche guest-starred as cannibalistic spree killer, Eddie Mays, and Lindsay Crouse played his mother, Mary. In the episode "What Fresh Hell?", Ned Vaughn guest-starred as Donald Curtis, a pedophile who abducts an eleven-year-old girl named Belinda Copeland.
Skyler Shaye appears in the episode "The Tribe" as Ingrid Griesen.
In the episode "Poison", Nick Jameson guest-starred as Edward Hill, a serial killer who murders people with poisonous drugs. In the episode "Riding the Lightning", Jeannetta Arnette guest-starred as Sarah Jean Dawes, an inmate on death row who is determined to make sure her son never finds out the truth of his parentage. Michael Massee guest-starred as Jacob Dawes, her husband and a serial killer who murdered several teenage girls. In the episode "Unfinished Business", Aaron Lustig guest-starred as Walter Kern, aka "The Keystone Killer", and Geoff Pierson guest-starred as Max Ryan, a retired FBI Agent who is determined to find the killer.
In the episode "The Tribe", Chad Allen guest-starred as Jackson Cally, a cult leader who tortures and murders college students. In the episode "A Real Rain", Ethan Phillips guest-starred as schizophrenic vigilante killer Marvin Doyle. David Aaron Baker played Will Sykes, an attempted copycat of Doyle who wanted to be famous, and Tonya Pinkins played Detective Nora Bennett, who leads the investigation of the killings. In the episode "Somebody's Watching", Katheryn Winnick guest-starred as Maggie Lowe, a serial killer and stalker who obsesses over actress Lila Archer, played by Amber Heard. Ian Anthony Dale guest-starred as Detective Owen Kim, who leads the investigation of the murders.
Peter Jacobson appears in the episode "Somebody's Watching" as Michael Ryer.
In the episode "Charm and Harm", Andy Comeau guest-starred as Mark Gregory, a serial killer and abductor who murders his victims by drowning them. In the episode, "Secrets and Lies", Ray Baker guest-starred as rogue CIA Agent Bruno Hawks. In the season finale "The Fisher King (Part I)", Charles Haid guest-starred as one of the series most notorious criminals, Randall Garner, aka "The Fisher King", a serial killer and abductor responsible for the attempted murder of Elle Greenaway. The incident proved to be so traumatizing, she resigned from the BAU the following season.
When a Seattle, Washington woman goes missing and authorities connect her disappearance with three unsolved murders, the FBI's Behavioral Analysis Unit sets out to apprehend the killer and rescue his latest victim. Unit chief Aaron Hotchner is assigned to determine whether veteran profiler Jason Gideon, called out of medical leave for this case, is fit to return to duty permanently.
When a Tempe, Arizona college student dies in the latest in a series of fires, the BAU attempts to think outside the box as they juggle profiling the serial arsonist-turned-serial killer and preventing them from setting another fire. Gideon recovers from a near-death experience and the team welcomes sex crimes expert Elle Greenaway (Lola Glaudini) into the fold.
When two explosions rip through Palm Beach, Florida communities, the BAU attempts to track down a bomber who is deliberately replicating the M.O. of incarcerated mass murderer Adrian Bale (Tim Kelleher) and Gideon finds himself forced to relive his memories of the events surrounding his encounter with Bale and subsequent nervous breakdown.
When six San Diego, California women are raped, murdered, and posed with their eyes glued open, the BAU sets out to profile a killer who evades the authorities by striking in broad daylight and blending into the neighborhoods he targets.
When the daughter of an Executive Assistant U.S. Attorney is kidnapped while leaving a party, the BAU juggles protecting the victim's twin sister, identifying the motive behind the kidnapping, and determining whether or not the abductor is one of their own.
When a sniper non-lethally guns down six Des Plaines, Illinois civilians and unintentionally kills one, the BAU works with local authorities to prevent him from executing another attack. Reid finds himself forced to work without a gun after failing his firearms qualification exam.
When two families living in two different states are found dead days after they were supposed to leave on vacation, the BAU sets out to profile a family annihilator who sees himself as the perfect father figure and is dedicated to punishing what he believes to be dysfunctional families.
When an undercover agent disappears the same night a Baltimore, Maryland family is found dead in two separate locations, the BAU works with the Organized Crime Unit to apprehend a hitman responsible for over one hundred murders.
A physicist with schizophrenia has a mental breakdown and holds Elle and four other civilians hostage on a passenger train en route to Dallas, Texas. Reid and the BAU attempt to establish trust with the shooter and prevent casualties by going along with the man's hallucinations.
When a high school student's body is found near Massanutten Mountain and his girlfriend is reported missing, the BAU attempts to determine whether or not the crimes were committed by a Satanic cult. Reid confides in his teammates about his battle with a series of recurring nightmares.
When two seemingly unrelated murders take place in Tennessee, the BAU launches a manhunt for a cannibalistic killer obsessed with a neighborhood youth. After injuring his leg in (what he tells the team was) a skydiving accident, Gideon finds himself forced to work remotely from Quantico, invading Garcia's space and driving her to distraction.
When an eleven-year-old girl is abducted in broad daylight while at a Wilmington, Delaware community park, the BAU works with local authorities to determine whether or not her father was responsible.
When eight Beachwood, New Jersey residents are poisoned with a combination of LSD and rohypnol, the BAU juggles identifying the poisoner and preventing a larger-scale incident from taking place.
On death row, only hours before their execution, the team is interviewing husband-and-wife serial killers responsible for the murders of over eighteen Florida teenage girls. Gideon suspects the wife is innocent and sets out to prove his theory before time runs out.
A notorious Philadelphia, Pennsylvania serial killer seemingly resurfaces after an eighteen-year absence, but with differing methods and older victims, and sends a taunting letter to retired FBI profiler Max Ryan (Geoff Pierson). The BAU struggles to determine if this is a copycat, or if the killer has resumed his killing spree.
When five New Mexico college students are tortured, mutilated and murdered, the BAU determines the crime was a pack killing by a racist, Manson Family-type cult, obsessed with pretending to be Native Americans. Hotch endures a tense reunion with his estranged brother Sean.
When three people are gunned down in New York City, the BAU sets out to track down a vigilante bent on exacting vengeance against criminals who got away with their crimes.
While conducting a profiling seminar in Los Angeles, California, Gideon and Reid set out to identify a murderous stalker obsessed with television starlet Lila Archer (Amber Heard), but Lila's growing attraction to Reid threatens to jeopardize the investigation.
When thirteen elderly women are sexually assaulted and murdered in Mexico, the BAU faces resistance from local authorities as they attempt to identify the perpetrator. Hotch juggles his responsibilities at work and his responsibilities at home.
When five young women are abducted, tortured, and drowned in hotel bathtubs throughout the South, the BAU sets out to apprehend a serial killer who changes his appearance to evade capture.
When an undercover CIA agent is tortured to death after helping an informant hide from her physically abusive yet high-powered husband, the BAU interrogates the four counter-terrorism agents connected to her case in an attempt to expose the traitor.
When each individual BAU member receives a mysterious message while on bureau-mandated vacation, the team suspects they have become pawns in an elaborate fantasy game and sets out to identify a budding serial killer with a deadly fixation on Arthurian legend.
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