The actor will appear in the last two episodes of Season 2, portraying the former history teacher and mentor to Noah Wyle's Tom Mason. In Season 1, Tom Mason proved to be a valuable commodity to the 2nd Mass, using his knowledge of military history to help the unit survive against the alien scourge.
Falling Skies, which stars Noah Wyle, Will Patton, Moon Bloodgood, Drew Roy, Seychelle Gabriel, Peter Shinkoda, and Colin Cunningham, was the highest-rated new series on cable last year, averaging an impressive 6.9 million viewers per episode, which is higher than practically every show on NBC this year.
TNT hasn't announced when Falling Skies Season 2 will premiere yet, although it will debut sometime this summer. Terry O'Quinn recently appeared in an arc on the CBS drama Hawaii Five-0.