Primetime Preview: The Return of 30 Rock!

Thank goodness! 30 Rock returns tonight. Here's a look at what else is on TV...

• 8:00 p.m. It's true, Elena: Stefan is a vampire on The Vampire Diaries (The CW); what clues will be unraveled next on FlashForward (ABC)? A new time slot for Community (NBC); a mystery at the museum on Bones (Fox).
• 8:30 p.m. There's a culture clash on Parks and Recreation (NBC).
• 9:00 p.m. No Pam or Jim on The Office (NBC); there's a special boy on Supernatural (The CW); a new episode of Fringe (Fox); we meet new doctors on Grey's Anatomy (ABC).
• 9:30 p.m. The third season of 30 Rock premieres (NBC).
• 10:00 p.m. An attorney is dead on The Mentalist (CBS).