The cast of The Big Bang Theory spent their Saturday night at a vibrant celebratory party at Vibiana in Los Angeles, according to Variety. Why? Because the show’s 200th episode is airing Tuesday, February 25th, and the actors, actresses, and crew that make the series happen could not be prouder.

The Big Bang Theory, which originally debuted in the fall of 2007 and is in the midst of its ninth season, has drawn in countless awards, most notably winning at least one Emmy in every year since 2010 (except 2012). For the last several years, the show has also clung to the title of #1 comedy.

It does not plan to wrap it up at its 200th episode either. CBS recently renewed the popular comedy for its 10th season, which will begin next fall, and it will undoubtedly continue on from there.

The 200th episode is set to revolve around Sheldon’s birthday, which coincidentally also happens to be February 25th, and fans can safely assume that it wouldn’t be a milestone episode without some drama mixed with a lot of hilarity.

In the fashion of monumental specials that have gone before this one, the episode will feature a slew of characters reviving their roles for the sake of the exceptional occasion. The list includes Dr. Beverely Hofstader, Leonard’s mother, played by The Good Wife actress Christine Baranski; Barry Kripke, who is played by John Ross Bowie; experimental physicist Leslie Winkle, played by The Talk host Sara Gilbert; and, of course, the list would not be complete without Sheldon’s arch nemesis, Wil Wheaton, played, naturally, by himself.

But in the spirit of the night, fans may be able to hope that there will be some surprise reprisals as well. After all, it wouldn’t be a special without a few hidden twists.

Alongside these returning actors, the episode will also guest star Adam West, who is most-known for his iconic lead in Batman, a character that fits in nicely with the show’s nerdy aesthetic.

To cap off the show’s achievements for the night, its name will now be cemented in Pasadena history. The town, in which The Big Bang Theory takes place, officially designated February 25th as “The Big Bang Theory Day,” so that long after the show concludes–probably at the end of its 50th season–every sub-mountainous Californian remember and celebrate this group of geeks and their antics.

At the cast party in the Vibiana, lead actor Jim Parsons looked back on his experience with auditioning for his role back in 2007:

“I remember spending a lot of time memorizing because it was probably the wordiest audition I’ve ever gone in on,” said Parsons. “Any humor was not going to be funny if I was struggling with these words, many of which I didn’t know and weren’t easy to say.”

The 200th episode will air Tuesday night at 8pm on CBS.