TV 'CSI' Cast Gathers for Mini Reunion Ahead of Series Finale By Raphael Chestang 5:30 PM PDT, September 17, 2015 This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page. 09:20'CSI' Cast Preps For Series Finale02:10'The Watchful Eye:' Meet the Cast of New Mystery Series (Exclusi…01:57Inside Jimmy Kimmel's Oscar-Hosting Preps and Plan to Avoid Gett…01:18’80 For Brady’ Cast Calls Out Wildest Co-Star! (Exclusive)03:26'Sister Wives' Star Meri Brown Calls Out Media for Misinformatio…09:04'Ginny & Georgia' Cast Spill on Season 2 Cliffhanger and Hopes f…08:21Sally Field, Jane Fonda, Lily Tomlin and Rita Moreno Spill '80 F…02:20Golden Globes: Glen Powell Jokes His ‘Top Gun’ Cast Is ‘Not Mean…03:26'80 For Brady’: Behind the Scenes With Jane Fonda, Tom Brady and…01:45‘That '90s Show’ Cast Looks Back at ‘That '70s Show’ and Spills …01:21'Ginny & Georgia': Cast Promises Season 2 Cliffhanger Tops Seaso…01:00'Servant's Final Season: The Cast Breaks Down Show's Dramatic Co…04:49Sherri Shepherd Recalls Barbara Walters Fighting to Cast Her on …01:02‘That '90s Show’s Callie Haverda Shares Reaction to Getting Cast…03:02'Teen Wolf' Cast on Whether Paramount+ Movie Is the End of Their…01:26'MILF Manor': First Look at TLC's New Dating Series (Exclusive)01:07‘Grease’ Gets the Prequel Treatment With ‘Rise of the Pink Ladie…04:20Steven Spielberg, Michelle Williams and 'The Fabelmans' Cast on …02:48Jane Fonda Shares Heartfelt Message About Motherhood While Refle… The cast of CSI: Crime Scene Investigation, past and present, gathered for a mini reunion in Beverly Hills on Wednesday before the show's series finale later this month. "We premiered with not a lot of fanfare on a Friday night and 19 million people showed up to watch it," Marg Helgenberger told ET at the Paley Center for Media of CSI's 2000 debut. WATCH: Marg Helgenberger on Returning for 'CSI' FarewellHelgenberger is returning for the two-hour farewell after leaving the show in season 12. William Petersen will also be back after he parted ways in the show's ninth season. "It's great," Petersen said about returning for the grand finale. "I've been gone for seven years. It was like getting into your old car again."But saying goodbye to the groundbreaking franchise will be bittersweet for the CSI stars."You know what it boils down to? People that you go to work with every day," Ted Danson said. "You're going to miss them."The show is ending its run after 15 seasons and launching numerous spinoffs, including CSI: NY, CSI: Miami and CSI: Cyber, which Danson will join as a regular. MORE: 'CSI' Is Officially Ending After 15 YearsCSI's spectacular send-off airs Sunday, Sept. 27 on CBS.Goodbye, 'CSI'! Looking Back on 15 Years of the Show This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page.