Season Four

Season Four will be released on DVD September 8, 2009. It will contain 26 episodes, and some special features.

Ratings
14.89 million viewers had watched the show on CBS.

Cast

 * Joe Mantegna - David Rossi
 * Thomas Gibson - Aaron Hotchner
 * Paget Brewster - Emily Prentiss
 * Shemar Moore - Derek Morgan
 * Matthew Gray Gubler - Dr. Spencer Reid
 * A.J. Cook - Jennifer Jareau
 * Kirsten Vangsness - Penelope Garcia

Highlights
JJ returns to the BAU and introduces the team to her new baby, whose father is William LaMontagne Jr. Reid and Prentiss are held captive by a dangerous Cult Leader, and Rossi steps in to negotiate their release. The season is filled with various types of criminals; Serial Arsonists, two-person killing teams, obsessive-compulsive killers, and even a serial killing priest. The end of the season also marks the first appearance of the BAU's most difficult case; a merciless and prolific serial killer known as The Reaper. The season finale, which features the disturbing case of brothers Mason and Lucas Turner also ends in a cliffhanger, as The Reaper returns to confront Hotch personally.