PASADENA (CBSLA.com) — Pasadena is celebrating the 200th episode of “The Big Bang Theory” this Thursday.

The city announced via Twitter that Feb. 25th has been declared “The Big Bang Theory Day.”

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The hit CBS comedy features its main characters living in Pasadena and working as Caltech scientists.

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The 200th episode airs Thursday on CBS and will feature Wil Wheaton as a special guest, according to KNX 1070 NEWSRADIO.

On Saturday night, the show’s co-creator Chuck Lorre and its cast gathered in downtown Los Angeles to celebrate the milestone.

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(credit: city of Pasadena / William Boyer)

(credit: city of Pasadena / William Boyer)