Returns: Thursday, April 3, at 9 pm/ET (CBS) Number of new episdoes: 6

Where we left off: Sara (Jorja Fox) left town - and Grissom. Warrick had a drug, alcohol and stripper-fueled meltdown and was accused of murder. What's next: "Grissom will be a little under the weather when we come back," exec producer Naren Shankar says. This necessitates a visit to his apartment from Catherine. "Basically she's there to snoop under the ruse of filling him in on a case," Shankar says. "She wants to know where he is with his relationship with Sara. She wanders into the kitchen and hits pay dirt." Career crisis: Grissom isn't looking to replace Sara, but Bonnie Bedelia guest stars as a woman from his past. He'll also question how long he can remain in his profession. (Petersen's contract is up this season. No word yet if he'll stay on.) Also returning on April 3: My Name is Earl ( Read preview) and Without a Trace ( Read preview). For more CSI preview, pick up TV Guide's Returning Favorites issue. Watch full episodes | Photos | More Returning Favorites coverage