‘CSI’ Movie Finale Starts Filming! Original Cast Reunited In Behind-The-Scene [PHOTO]!

Despite the news of fan-loved characters opting out of the "CSI" movie finale, some of the decade-long series' original characters will still be appearing in the last special episode of the show.

Although CBS announced its decision to end the long-running crime-drama earlier this year, the network didn't want to leave fans hanging. Preparations for a final reunion film begun right away.

Filming reportedly begun last July 29 and Marg Helgenberger shared a sneak peek of the original team being reunited on set.

Helgenberger, who played Catherine Willows for 12 seasons, posted a reunion photo on her Twitter page. In the picture were William Petersen, who played the original entomologist and department chief, Gil Grism, and Paul Guilfoyle a.k.a. Detective Jim Brass, who left the show on its 14 year.

Also pictured are current cast members, Eric Szmanda (Greg Sanders) and Jorja Fox (Sarah Sidle).

The snap seems to be taken from the set of the upcoming made-for-TV movie airing on CBS this fall. According to Cinemablend, the "CSI" movie finale would be a "big draw, even for fans who haven't tuned in for an episode of the series in quite some time."

With some beloved characters coming back, like Gil Grissom, Catherine Willows and Jim Brass, viewers who aren't updated with the series' latest seasons would hopefully be tuning in for a one and only chance to see the original cast members being in one screen with the current team.

Unfortunately, other favorites like George Eads, who played Nick Stokes from the pilot episode to the last episode in season 15, decided to forgo the reunion. His decision to not reprise his role one last time allegedly caused some major revisions to the script just before filming started a couple of weeks ago.

Julie Finlay, played by Elisabeth Shue, won't be coming back as well. Viewers last saw her character in a coma after being brutally attacked by the Gig Harbor killer.

On the other hand, current CSI department chief, D.B. Russell, played by Ted Danson, will be joining the TV movie.

"The fans will get to see the people they really grew up with with that series," he reportedly told Zap2It during a press tour. "It's really honoring of the cast members who were there from the very beginning. It's cool."

Danson would be moving on the "CSI" spinoff, "CSI Cyber," after his stint in the "CSI" movie finale.