While there may be trouble brewing (again) at that other Chuck Lorre-produced sitcom, this very geeky, very funny “nerd-com” is enjoying great success in its sixth season. Tonight Sheldon and Howard (Jim Parsons and Simon Helberg) tussle over a parking spot. 8 p.m. Thursday on CBS (seattletimes.com/tvlistings).

“Last Resort,” 8 p.m. (ABC): Marcus brings the islanders and the members of the Colorado together for a feast in the spirit of Thanksgiving; Grace searches for the truth when an essential crew member is accused of a crime.

“30 Rock,” 8 p.m. (NBC): An encounter with Dennis spurs Liz and Criss to step up their efforts to start a family.

“Glee,” (Fox): As sectionals approach for New Directions, recent McKinley graduates volunteer to mentor the glee club during Thanksgiving break.

The New York Times