Tonight's Fall Premieres: 'Gossip Girl,' 'Terra Nova,' 'Hart of Dixie' and 'Mike & Molly' [Monday 9/26]

Last night brought us the return of one of cable's best series in "Boardwalk Empire," the first show of the final season of "Desperate Housewives" and season premieres from animated classics like "The Simpsons" and "Family Guy."

Tonight Blake Lively and Leighton Meester return to "Gossip Girl," Fox's big Steven Spielberg-helmed dinosaur series "Terra Nova" launches, and Emmy Award winner Melissa McCarthy returns to "Mike & Molly."

Read on to find out more about the newest offerings on TV tonight.

8:00 PM EST
Gossip Girl (CW)

Is sunny, carefree Los Angeles just what the doctor ordered for Serena, Chuck and Nate? Everything started out so well last season with Blair and Serena prancing around Paris and Chuck Bass dating a prostitute while dressing like a “Newsies” extra, but went downhill from there. Can "Gossip Girl" regain its flirty charm and get its mojo back? Find out tonight.

8:00 PM EST
Terra Nova (2 Hour Premiere) (Fox)

Visionary Oscar-winning writer/director/producer Steven Spielberg reunites with the prehistoric in his latest series on Fox, "Terra Nova," which takes its first bow as part of FOX's fall line-up tonight. At $5 million, this is one of the most expensive pilots ever made, and Fox has quite a bit riding on the show's sucess.

Watch a trailer for the premiere of "Terra Nova":

9:00 PM EST
Hart of Dixie (CW)

"Doc Hollywood" with no classic Porsche, "Hart of Dixie" stars Rachel Bilson as a young doctor just graduated at the top of her class in medical school who leaves the high pressure medical world of New York to take a job working with a stranger she just met at a practice in Bluebell, Alabama.

When she arrives, she finds that the stranger has died and left her half his medical practice, meaning she must quickly learn to adjust and practice medicine in a small-town, while learning to adjust her own big-city attitude to the reality of the situation.

Watch a preview for "Hart of Dixie":

9:30 PM EST
Mike & Molly (CBS)

Melissa McCarthy won the Emmy Award for her work on this CBS series - ostensibly a sitcom about being fat - and drew rave critical reviews for her hysterical performance in "Bridesmaids." "Mike & Molly" shares a little DNA with "Roseanne" in that it portrays real-looking characters from a working class family in relatively realistic situations.

McCarthy recently sold a pilot to CBS, so she may not be too long for this series and you might want to catch her Emmy-winning comedy bit on the show while you can.

Watch a preview for "Mike & Molly":