Season 4

01 Mayhem Episode 124th September 2008 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. 02 The Angel Maker Episode 21st October 2008 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. 03 Minimal Loss Episode 38th October 2008 Reid and Prentiss are taken hostage when they go under cover to investigate possible child abuse at an underground cult. 04 Paradise Episode 422nd October 2008 The BAU joins the manhunt to catch a serial killer who conceals the manner of his crimes by staging car accidents. 05 Catching Out Episode 529th October 2008 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. 06 The Instincts Episode 65th November 2008 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. 07 Memoriam Episode 712th November 2008 As Reid's investigation of a young boy's murder in Las Vegas continues, he discovers possible connections to his own past. 08 Masterpiece Episode 819th November 2008 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. 09 52 Pickup Episode 926th November 2008 Agents Prentiss and Todd go undercover to profile a serial killer who uses skills of persuasion to lure women into danger. 10 Brothers in Arms Episode 1010th December 2008 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. 11 Normal Episode 1117th December 2008 The team investigates a serial killer who shoots luxury car owners on Southern California's freeways. 12 Soul Mates Episode 1214th January 2009 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 13 Bloodline Episode 1321st January 2009 The BAU team becomes involved in the case of a family working together to abduct young girls. 14 Cold Comfort Episode 1411th February 2009 The mother of an abducted child works with the BAU to apprehend a serial killer who kidnaps, murders, and embalms his victims. 15 Zoe's Reprise Episode 1518th February 2009 The team pursues a copycat serial killer who is recreating the techniques used by past famous murderers. 16 Pleasure Is My Business Episode 1625th February 2009 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. 17 Demonology Episode 1711th March 2009 Agent Prentiss has a personal connection to one of the victims in a series of deaths with religious overtones. 18 Omnivore Episode 1818th March 2009 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. 19 House on Fire Episode 1925th March 2009 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. 20 Conflicted Episode 208th April 2009 The team travels to Fort Lauderdale during spring break to find a serial killer who is targeting co-eds on vacation. 21 A Shade of Gray Episode 2122nd April 2009 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. 22 The Big Wheel Episode 2229th April 2009 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. 23 Roadkill Episode 236th May 2009 An unsub who kills with his car is the subject of a BAU investigation. 24 Amplification Episode 2413th May 2009 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. 25 To Hell... (1) Episode 2520th May 2009 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. 26 ...And Back (2) Episode 2620th May 2009 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.