“30 rock” (8 p.m., nbc): “30 Rock” fans, rejoice. Tina Fey’s Emmy-

“30 rock” (8 p.m., nbc): “30 Rock” fans, rejoice. Tina Fey’s Emmy-winning sitcom finally is back in prime time. Tonight’s Season 6 opener has the gang returning to work after a holiday break, and Jenna (Jane Krakowski) contemplating a new career as a hateful reality-TV judge.

“rob” (8:31 P.M., CBS): Clearly, not a lot of imagination went into the naming of the new series “Rob,” but maybe they saved it for the scripts. The sitcom stars Rob Schneider as a long-time bachelor who marries into a tight-knit Mexican-American family and struggles to adjust to the culture shock.

tv listings, B6