When an SUV carrying members of the team explodes, the rest of the team fights to save them and catch the terrorists responsible for the bombing.
01 October, 2008720p
S4 E2 - The Angel Maker
A series of murders is linked to a serial killer executed a year earlier, and the BAU team must find the link between the dead killer and the new spate of crimes.
08 October, 2008720p
S4 E3 - Minimal Loss
Reid and Prentiss are taken hostage when they go under cover to investigate possible child abuse at an underground cult.
22 October, 2008720p
S4 E4 - Paradise
The BAU joins the manhunt to catch a serial killer who conceals the manner of his crimes by staging car accidents.
29 October, 2008720p
S4 E5 - Catching Out
The BAU investigates a series of murders that appear to be connected to a killer who jumps trains and chooses his victims based on their proximity to the railway.
05 November, 2008720p
S4 E6 - The Instincts
While investigating the abduction of a young boy in Las Vegas, Dr. Reid starts to have dreams that might help reveal buried memories from his childhood.
12 November, 2008720p
S4 E7 - Memoriam
As Reid's investigation of a young boy's murder in Las Vegas continues, he discovers possible connections to his own past.
19 November, 2008720p
S4 E8 - Masterpiece
When a narcissistic psychopath confesses he has killed seven people and more will die, the team must locate his latest victims before it is too late.
26 November, 2008720p
S4 E9 - 52 Pickup
Agents Prentiss and Todd go undercover to profile a serial killer who uses skills of persuasion to lure women into danger.
10 December, 2008720p
S4 E10 - Brothers in Arms
The BAU team hunts for a serial killer who targets members of the police department in Phoenix, Ariz., a case that hits close to home for Morgan, a former cop.
17 December, 2008720p
S4 E11 - Normal
The team investigates a serial killer who shoots luxury car owners on Southern California's freeways.
14 January, 2009720p
S4 E12 - Soul Mates
The BAU team suspects a member of an affluent community in Atlanta is responsible for the disappearance of a local young woman and that the suspect may have worked with an accomplice
21 January, 2009720p
S4 E13 - Bloodline
The BAU team becomes involved in the case of a family working together to abduct young girls.
11 February, 2009720p
S4 E14 - Cold Comfort
The mother of an abducted child works with the BAU to apprehend a serial killer who kidnaps, murders, and embalms his victims.
18 February, 2009720p
S4 E15 - Zoe's Reprise
The team pursues a copycat serial killer who is recreating the techniques used by past famous murderers.
25 February, 2009720p
S4 E16 - Pleasure Is My Business
The team searches for a female suspect who uses her professional skills as a high class call girl to lure and kill high-powered executives.
11 March, 2009720p
S4 E17 - Demonology
Agent Prentiss has a personal connection to one of the victims in a series of deaths with religious overtones.
18 March, 2009720p
S4 E18 - Omnivore
Agent Hotchner revisits the first case he worked at the BAU when details come forth that one of the deadliest serial killers in New England's history has struck again after a 10-year hiatus.
25 March, 2009720p
S4 E19 - House on Fire
The BAU team must track down a serial arsonist who instills fear in a small town by setting fire to community meeting places and killing several residents in the process.
08 April, 2009720p
S4 E20 - Conflicted
The team travels to Fort Lauderdale during spring break to find a serial killer who is targeting co-eds on vacation.
22 April, 2009720p
S4 E21 - A Shade of Gray
When profiling a series of child abductions and murders, the team discovers that one of the cases may not be the handiwork of the serial killer they apprehended.
29 April, 2009720p
S4 E22 - The Big Wheel
When the team is sent a videotape from a serial killer detailing one of his crimes, they discover a hidden message asking them to help him stop his murderous ways.
06 May, 2009720p
S4 E23 - Roadkill
An unsub who kills with his car is the subject of a BAU investigation.
13 May, 2009720p
S4 E24 - Amplification
When a new type of chemical warfare is released into the open air, the BAU must act quickly to find the source before any more innocent people are exposed.
20 May, 2009720p
S4 E25 - To Hell... (1)
The BAU tracks a serial killer who chooses junkies, prostitutes and the homeless off the streets of Detroit as his victims and takes them across the border into Canada, and an agent's life is in peril.
20 May, 2009720p
S4 E26 - ...And Back (2)
The BAU tracks a serial killer who chooses junkies, prostitutes and the homeless off the streets of Detroit as his victims and takes them across the border into Canada, and an agent's life is in peril.
