Smallville's Justin Hartley to Appear on Chuck

Justin Hartley Chuck vs. Green Arrow?Smallville star Justin Hartley will guest-star on Chuck this season."Couple of days on the show Chuck this week," the actor tweeted Tuesday. "Great people over there. Fun times."Chuck spies The Matrix's Carrie-Anne MossHartley did not share any details about his role, but Zap2It reports that he will appear in the season's second episode as the brother of Jeff Fahey's character. Fahey (Lost) will play Karl Sneijder, a diamond company boss who has been investigated in the past for criminal activity. He is forced to seek help from Carmichael Industries when his younger brother, Wesley (Hartley) - a Dartmouth- and Oxford-educated anthropologist who has stayed far away from the world of espionage - has been kidnapped by Karl's enemies.VIDEO: Chuck stars geek out over Star Wars' Mark HamillHartley and Fahey join Carrie-Anne Moss and Mark Hamill as Chuck guest stars on its fifth and final season.An e-mail to NBC was not immediately returned.Chuck returns Friday, Oct. 21 at 8/7c on NBC.