'Person of Interest' Books Margo Martindale, 'Lost's' Ken Leung

They'll guest star on Season 2 of the CBS drama.
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Ken Leung and Margo Martindale

Person of Interest is adding two familiar faces for its upcoming second season.

The drama has enlisted Emmy winner Margo Martindale (Justified) to pop in to the CBS procedural about a former CIA agent (Jim Caviezel) and a mysterious billionaire (Michael Emerson), with Lost's Ken Leung also checking in for a guest turn.

CBS announced the castings via Twitter and declined to provide details on who Martindale and Leung would portray.

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Martindale, who co-starred on CBS' short-lived A Gifted Man, also booked a role in Showtime's upcoming drama Masters of Sex. She's repped by Gersh.

Leung, who will reunite with Lost's Emerson and Person of Interest exec producer J.J. Abrams during his turn, most recently guest starred on CBS' The Good Wife and filmed Sarah Silverman's failed pilot Susan 313 for NBC. He's repped by Hartig Hilepo Agency.

Person of Interest returns Thursday, Sept. 27 at 9 p.m. on CBS.

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