Matt Damon

30 Rock's latest big-name get: Matt Damon.

The 39-year-old actor, fresh off an Oscar nomination for Invictus and a Lifetime Achievement Award from American Cinematheque, will guest-star on the show later this season, TVGuide.com has confirmed. Details of his role are being kept under wraps, so let the guessing games begin.

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Will Damon spoof himself (which he clearly enjoys doing on Jimmy Kimmel Live)? Or will he play another lover for Liz, or a Bostonian buddy of Jack's (which would be a Departed reunion for him and Alec Baldwin). Or maybe he'll become a new writer for TGS and bring his screenwriting Oscar (and Ben Affleck) with him?

Share your guesses below!

Damon's casting was first reported by Entertainment Weekly.