'Chuck': Beau Garrett, 'Lost' alum Eric Lange guest-star in Season 5

"Chuck" has added two more guest stars with geek cred to its roster for Season 5.

Beau Garrett ("Tron: Legacy") and Eric Lange ("Lost") will both appear in the season's fifth episode, which series star Zachary Levi is directing. Zap2it was on set Tuesday (Sept. 13) and saw the two guest stars in action, along with fellow "Chuck" newcomer Carrie-Anne Moss.

Garrett, who also starred on CBS' "Criminal Minds: Suspect Behavior" last season, is playing a cult leader in the episode. A mission leads Chuck (Levi) and Sarah (Yvonne Strahovski) to go undercover within the commune.

That mission involves Lange's character, a former "technological terrorist" who in his former life created a lethal virus but is now a member of the commune. As you might expect, things get a little hairy as Chuck and Sarah try to carry it out. Lange played Dharma Initiative head of research Stuart Radzinsky on "Lost," and he also has a recurring part on Nickelodeon's "Victorious" as Mr. Sikowitz.

"Chuck" returns to NBC Friday, Oct. 21.