ET's on the set of the thrilling crime-drama series "Criminal Minds," where special guest-star Cybill Shepherd gives us the dish on her upcoming episode.

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Wonder what the stars did during the writers strike? ET is behind the scenes of some of your favorite CBS TV shows to give you the scoop. We're on the set of "Two and a Half Men" with CHARLIE SHEEN and JON CRYER; "CSI: Crime Scene Investigation" with MARG HELGENBERGER and GEORGE EADS;  "Criminal Minds" with THOMAS GIBSON and JOE MANTEGNA and more to get the 411 on their hiatus happenings.

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Actor JOE MANTEGNA will fill in the space left behind by "Criminal Minds" star MANDY PATINKIN. The Emmy and Golden Globe-nominated Mantegna most recently appeared in the USA network miniseries "The Starter Wife."

Patinkin unexpectedly decided to leave the CBS crime drama last month.

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Each week on "Joan of Arcadia," god appears in different disguises to teenage Joan (AMBER TAMBLYN) and tries to show her the difference she can make in her family's life and the lives of others around her.

On tonight's Insider, ET talks to the stars of the CBS series (airing Friday nights at 8), its creator, and several members of the clergy to find out what they think about a teenage girl who talks directly to god.

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