AceShowbiz -

Jeff Fahey and Justin Hartley are set to take part in the final season of "Chuck". An NBC spokesperson has confirmed that both actors will guest star in the second episode of season 5 as brothers.

The Frank Lapidus of "Lost", Fahey, will play Karl Sneijder, the president and CEO of diamond giant Natal Jewelers with mines in South Africa. Although CIA has kept a watch on him for alleged criminal activity, it hasn't been able to collect enough evidence to charge him.

Hartley, who is best known for his role as Oliver Queen/Green Arrow on "Smallville", will take the role of Wesley Sneijder, Karl's younger brother who works as an anthropologist. Although Wesley has successfully kept himself away from his brother's shady dealings, he could not stay away completely from the dirty things when Karl's enemies kidnap him.

As his younger brother is in danger, Karl will turn to Chuck and Sarah's newly formed spy business Carmichael Industries for help.

34-year-old hunk Hartley has recently shared to fans that he had a good time on the set. "Couple of days on the show Chuck this week," he tweeted on Tuesday, August 9. "Great people over there. Fun times."

The fifth and last season of "Chuck" will premiere Friday, October 21 at 8 P.M. on NBC. Other stars who have been billed to appear on the show are Mark Hamill and Craig Kilborn as the baddies.