Jason Alexander Jason Alexander

Jason Alexander is joining the cast of Fox's upcoming comedy The Grinder.

The Seinfeld alum will play Cliff Beamis, an egomaniacal tough-guy who is the writer/creator of the series' show-within-a-show.

The Grinder stars Rob Lowe as an actor who played a lawyer on a TV show called The Grinder for eight years, and decides that he wants to become a real attorney, much to the chagrin of his polar-opposite brother (Fred Savage), a real lawyer. Got all that?

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There's no word on how frequently Alexander's character will appear on the show.

Lowe shared the news of Alexander's casting on Twitter late Tuesday night.

The Grinder premieres Tuesday, Sept. 29 at 8:30/7:30c on Fox. Will you watch?