ET's own Steven "Cojo" Cojocaru has the star of top drama "CSI," Marg Helgenberger, on the ET stage! The strawberry blonde knock-out dishes on everything from William Petersen's departure, to her new cast mates, to her political beliefs, to her only son's departure for college, and finally, to what's going on with her character (Catherine Willows) in the hot new ninth season of her hit show. Also, Cojo awards Marg a special prize!

Marg plays a game of fill-in-the-blank with Cojo, and opens up about the reason behind the success of CSI.

"Ultimately, I think it's a very smartly-written show, a great mystery show with incredible style, and a cast that has an enormous amount of chemistry."

Plus, the plot always thickens! The effects of last season's cliffhanger shooting death of Warrick Brown (Gary Dourdan) will carry over into the new season -- sending everyone in the "CSI" lab into motion to solve the heinous crime against one of their own. Catch Marg on the season premiere of "CSI" Thursday, Oct. 9 on CBS.