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- Season 4 overviewSep 24, 2008-May 20, 200926 episodesSeason 4 episodes1. Mayhem Sep 24, 2008
- An SUV explodes with team members inside; the others fight to save them and find the terrorists.
- 2. The Angel Maker Oct 1, 2008
- The BAU team must find the link between a dead killer and a new spate of murders.
- 3. Minimal Loss Oct 8, 2008
- Reid and Prentiss go under cover to investigate an underground cult.
- 4. Paradise Oct 22, 2008
- The team searches for a serial killer who stages car accidents.
- 5. Catching Out Oct 29, 2008
- The team searches for a serial killer who targets people who live near the railway.
- 6. The Instincts Nov 5, 2008
- Dr. Reid starts to have dreams that might help reveal buried memories.
- 7. Memoriam Nov 12, 2008
- Dr. Reid investigates a murder that he thinks is connected to his childhood.
- 8. Masterpiece Nov 19, 2008
- A self-confessed serial killer sends the team on a massive manhunt.
- 9. 52 Pickup Nov 26, 2008
- A serial killer uses skills of persuasion to lure women into danger.
- 10. Brothers in Arms Dec 10, 2008
- The BAU team hunts for a serial killer who targets members of a police department in Arizona.
- 11. Normal Dec 17, 2008
- The team investigates a freeway killer who shoots owners of luxury cars.
- 12. Soul Mates Jan 14, 2009
- The team searches for answers when a young woman is abducted from an affluent community in Florida.
- 13. Bloodline Jan 21, 2009
- The BAU team tracks a family of suspects working together to abduct young women.
- 14. Cold Comfort Feb 11, 2009
- Searching for a suspect who abducts, kills and embalms his victims.
- 15. Zoe's Reprise Feb 18, 2009
- The team hunts for a copycat serial killer who is mimicking famous killers of the past.
- 16. Pleasure Is My Business Feb 25, 2009
- The team searches for a female serial killer who targets high-powered executives.
- 17. Demonology Mar 11, 2009
- The team investigates a series of deaths with religious overtones.
- 18. Omnivore Mar 18, 2009
- BAU agents search for one of the most notorious serial killers in New England.
- 19. House on Fire Mar 25, 2009
- The team hunts for a serial arsonist who targets community meeting places in a small town.
- 20. Conflicted Apr 8, 2009
- The team searches for a serial killer who is targeting coeds on spring break.
- 21. A Shade of Gray Apr 22, 2009
- The team realizes that a child abduction may not be the work of the person charged.
- 22. The Big Wheel Apr 29, 2009
- A killer sends the team a videotape detailing one of his crimes.
- 23. Roadkill May 6, 2009
- The team suspects that a series of vehicular homicides may be the work of a serial killer.
- 24. Amplification May 13, 2009
- The team searches for the source of a toxic substance that is released into the public.
- 25. To Hell ... May 20, 2009
- The team searches for a border-crossing serial killer who targets prostitutes and the homeless.
- 26. To Hell... And Back May 20, 2009
- The team searches for a border-crossing serial killer who targets prostitutes and the homeless.