After more than 6 years, the “CSI” (Crime Scene Investigation) series is making a return. Grissom (William Petersen) and Sarah Sidle (Jorja Fox) are back in Las Vegas after a new threat has cropped up.

Grissom and Sidle won’t be the only one’s returning on “CSI: Vegas.”  David Hodges (Wallace Langham) will be back for the TV series with other familiar faces like Jim Brass (Paul Guilfoyle) making guest appearances. It was not mentioned if other former cast members will follow Guilfoyle.

Among the newcomers include Paula Newsome, Mandeep Dhillon, Matt Lauria, and Mel Rodriguez.

It remains to be seen what this new threat is all about. Regardless, it will be up to Grissom, Sidle and Hodges to to their part in helping fend off the new threat that aims to bring down the whole CSI crime lab.

Old friends are bound to crop up, but it will be the new threats that will take center stage. In the trailer alone, it seems pretty clear that the old CSI gang was persuaded to return and share their expertise.

Maxine Roby (Newsome), the new head of the Vegas Crime Lab, could be heard saying "Do you think I could persuade you to come back to CSI?" after which the familiar “Who Are You” song plays.

But clearly, a lot has changed since their last appearance. Everything is set in 2021 and it appears past cases, as well as how they were handled, are in question.

There was no mention of how many episodes should be expected from “CSI: Vegas.” All that is known right now is that the first episode is titled “Legacy,” something that is fitting to welcome back at least some of the old faces of the old CSI gang.

“CSI: Vegas” was originally slated for a September release but the premiere date has been bumped to Oct. 6, 2021, at 10:00 p.m. ET on CBS. It will also be available via stream at Paramount+ although this requires a subscription.

Actress Jorja Fox (L) and actor William Petersen Actress Jorja Fox (L) and actor William Petersen Getty Images | Frederick M. Brown