"The Big Bang Theory" 8 p.m. CBS (seventh season debut) — Leonard is away while Sheldon and Penny reveal secrets.

"Glee" 9 p.m. Fox (fifth season debut) — The New Directions perform Beatles classics.

"Grey's Anatomy" 9 p.m. ABC (10th season debut) — Mudslide victims arrive in the ER.

"The Crazy Ones" 9:01 p.m. CBS (new series) — Kelly Clarkson guests as Robin Williams returns to TV after three decades.

"The Michael J. Fox Show" 9:31 p.m. NBC (new series) — Michael J. Fox plays a TV reporter with Parkinson's Disease.

"Elementary" 10:01 p.m. CBS (second season debut) — Holmes and Watson travel to London to help a former mentor solve a mystery.