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.
- Directed by
- John Gallagher
- Written by
- Oanh Ly
Guest stars
All episodes — Season 4
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S4 E1Mayhem
Sep 24, 20088.440 min
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.
S4 E2The Angel Maker
Oct 1, 20087.841 min
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.
S4 E3Minimal Loss
Oct 8, 2008842 min
Reid and Prentiss are taken hostage when they go under cover to investigate possible child abuse at an underground cult.
S4 E4Paradise
Oct 22, 2008840 min
The BAU joins the manhunt to catch a serial killer who conceals the manner of his crimes by staging car accidents.
S4 E5Catching Out
Oct 29, 20087.640 min
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.
S4 E6The Instincts
Nov 5, 20088.142 min
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.