Eric Frentzel

The BAU team investigates a series of murders in Bakersfield, Calif., which have left the victims unidentifiable. Also, the team welcomes new agent Kate Callahan into the BAU fold, who assists them in their efforts in solving the cases. Jennifer Love Hewitt joins the cast as FBI undercover agent Kate Callahan. Kerr Smith guest stars.

Team Scorpion must find a boy from Ralph's class who goes missing on a field trip after he accidentally has a run-in with a deadly criminal. Also, Toby gets closer to finding out the identity of Happy's husband.

Ray and Mickey make a desperate attempt to get Terry released from prison after discovering he's killed an Aryan and his life is in danger. Meanwhile, Mickey and Daryll pitch a new and improved strategy to Gary's prostitutes, Bunchy invests in putting on a Luchadora show to keep Teresa around - and Abby hits her breaking point with the family.

The CSI team investigates the death of a homeless man who had a huge winning streak at a small casino. Peri Gilpin returns as Barbara Russell. Matt Davis guest stars as day shift CSI Sean Yeager.