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. 03:23'CSI' Cast Preps For Series Finale07:30'Cobra Kai' Season 4: Cast Reacts to All Valley Tournament Resul…08:04'How I Met Your Father' Cast on Their Dream Guest Stars From the…01:54‘Scream’ Cast on ‘Emotional’ Reunion for 5th Installment (Exclus…03:29‘Yellowjackets’: Everything to Know Before Season 1 Finale03:39Selena Gomez Says She Never Felt 'Pretty Enough' While Using Soc…03:11‘Joe Millionaire: For Richer or Poorer’: What to Expect From the…02:41Bob Saget Funeral: 'Full House' Cast and More Attend Memorial09:18Remembering Bob Saget: ‘Full House’ Cast and Famous Friends Pay …03:45‘Fame’ Cast Reunites as They Celebrate the Show’s 40th Anniversa…01:20'Mayor of Kingstown' Finale Sneak Peek: Jeremy Renner Gets Into …09:35'Teen Mom: Family Reunion' Cast Reacts to Farrah Abraham’s Shock…01:37‘Encanto’ Voice Cast Gives Behind-the-Scenes Look in Hilarious O…04:24'Euphoria' Cast on Their Close Bond Amid a 'Chaotic' Season 2 (E…01:10Milo Ventimiglia Celebrates Walk of Fame Honor With 'This Is Us'…02:44How ‘Blossom’ Cast Reunion Came About on ‘Call Me Kat’ Season 2 …07:35'Cobra Kai' Season 4: Ralph Macchio and William Zabka on Final…03:35'Yellowstone': Kelly Reilly and Cole Hauser React to Rip and Bet…07:18‘Jersey Shore: Family Vacation’ Cast Shares Inside Scoop on Film… 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 Years CSI'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.