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Mayhem is the first episode of the fourth season of Criminal Minds, and the sixty-sixth episode overall.
Starring: Joe Mantegna (David Rossi), Paget Brewster (Emily Prentiss), Kirsten Vangsness (Penelope Garcia), Shemar Moore (Derek Morgan), Matthew Gray Gubler (Dr. Spencer Reid), A.J. Cook (Jennifer "JJ" Jareau), Thomas Gibson (Aaron "Hotch" Hotchner)