‘Community': Jason Alexander Filming ‘Crazy’ Guest Spot

"Seinfeld" veteran Jason Alexander tweets that he's filming an episode of the NBC sitcom "Community" this week

"Community" might be losing a Chevy Chase, but it's gaining a Jason Alexander.

Former "Seinfeld" star Alexander, who played neurotic bumbler George Costanza on the series, will guest-star on the beleaguered (but cherished) NBC comedy, and while the actor is tight-lipped on the details, he promises that the episode will be a doozy.

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Also read: Chevy Chase Exiting "Community"

"Filming a crazy episode of 'Community' this week," the actor tweeted early Tuesday. "Can't say much about it but it's a fun one."

It is not known what role Alexander, who guest-starred on "Two and a Half Men" earlier this year, will play on the series. An individual familiar with the casting told TheWrap that Alexander's episode will air in late spring next year.

Also read: Jason Alexander Apologizes for Calling Cricket "Gay"

Last month, news broke that Chevy Chase — who plays Pierce Hawthorne on the series — is leaving "Community," following an ugly standoff with the show's creator and former showrunner, Dan Harmon, and an incident when he reportedly tossed out the N-word, after complaining about his character's racism. Chase will appear in most of the episodes of the upcoming fourth season.

"Community" returns to the air Feb. 7.