CBS has a big farewell planned for "The Big Bang Theory."

The network will air a half-hour retrospective special on the night that the series finale airs, Deadline reports. Called "Unraveling the Mystery: A Big Bang Farewell," it will be a walk down memory lane with stars Johnny Galecki (Leonard) and Kaley Cuoco (Penny). They'll discuss their 12 years on the series and give viewers some new behind-the-scenes intel, including sharing memorable moments and leading a set tour.

The end of "The Big Bang Theory" was announced in August, when word came that the show's 12th season would be its last. It later was reported that star Jim Parsons (Sheldon) had decided to move on; as one of the show's big three stars alongside Galecki and Cuoco, his planned exit prompted the end.

The final season has been bittersweet for fans, but it has had a lot of high points, of course. For example, "The Big Bang Theory" recently filmed its 276th episode, making it the longest-running multi-camera sitcom in TV history. We expect to celebrate that major milestone and others in the upcoming special.

"Unraveling the Mystery: A Big Bang Farewell" airs Thursday, May 16 at 9:30 p.m. ET/PT on CBS.

[via: Deadline]