By Lynette Rice
Updated February 03, 2012 at 09:37 PM EST
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Terry O’Quinn just booked another high-concept drama series.

The man best known as John Locke from Lost will guest star in a two-episode arc of TNT’s Falling Skies when it returns for its second season this summer, EW has learned exclusively. He’ll appear in the drama’s last two episodes as a former history professor and mentor to Tom Mason (Noah Wyle).

O’Quinn last appeared on Hawaii Five-0.

For the uninitiated, Falling Skies takes place during the aftermath of an invasion by an alien military forces. Wyle’s character is a Boston history professor who uses his knowledge of military history to serve as second-in-command of a regiment of resistance fighters.

Falling Skies, which is from Steven Spielberg and DreamWorks TV, averaged more than 6.9 million viewers in its first season and ranks as basic cable’s No. 1 new series for 2011. It also finished last summer as basic cable’s No. 1 drama among the key adult demos.

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Episode Recaps

Falling Skies

In the aftermath of an alien invasion, Noah Wyle and a band of surviving humans desperately fight to survive
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