Eliza Dushku

The Big Bang Theory is calling in yet another sexy sci-fi guest star.

Eliza Dushku will guest-star in an episode of the geektastic CBS comedy, a studio rep tells TVGuide.com. The 29-year-old actress, best known for her starring roles in Dollhouse and Buffy the Vampire Slayer, is slated to appear in Episode 7 as an FBI agent who questions Wolowitz's friends so he can get top-secret security clearance.

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Dushku's appearance follows previous nerd icons such as Battlestar Galactica's Katee Sackhoff and Terminator: The Sarah Connor Chronicles' Summer Glau.

The Big Bang Theory returns Thursday at 8/7c on CBS.