Big night television tonight, as America's favorite sitcom is back and a superstar returns to network tv.

On CBS it's time for a nerd party! Check out the one hour premiere of "Big Bang Theory" at 8.

9pm-Robin Williams is back on network television in "The Crazy Ones" Look for a cameo tonight from Kelly Clarkson!

9:30-11 seasons and counting, "Two and a Half Men" adds new cast member Amber Tamblyn to take the place of Angus T. Jones.

10pm-"Elementary" begins it's sophomore year.

8pm-On NBC the very funny "Parks and Recreation" was robbed once again for some Emmy love, but kicks the night off with a one-hour premiere.

9pm-TV legend Michael J. Fox makes a very welcome return to situation comedy, with "The Michael J. Fox Show"

10pm-"Parenthood" makes it's premiere.

8pm-ABC airs of rerun of the best rated new rated show of the young season "Marvel's Agents of S.H.E.I.L.D.

9pm- Grey's Anatomy begins it's 10th year with a 2 hour debut.

On Fox at 8pm, it's yet another night of "The x-Factor" but the highlight of the night for Gleeks is the new season of "Glee" at 9pm.