Always Sunny Goes Back to High School, and Other TV to Have You Raging Tonight

Rob McElhenney, Charlie Day, Danny DeVito and Kaitlin Olson in It's Always Sunny in Philadelphia's "The High School Reunion, Part 2: The Gang's RevengeIt's Thursday, December 15th!  Your round of weekly TV continues as the holdays loom ever closer, and all your favorite series move toward mid-season finales and shocking cliffhangers.  Speaking of which, how about last night's surprising twist on the always spine-tingling American Horror Story? 

Time to start wrapping up all your holiday shopping and curl up at night with the best shows on the best night of the week for TV, and TVRage has your guide to everything you need to watch tonight!

The X Factor - "Week 8 Eliminations" - The contestants face another round of eliminations from four to three, with performances by judge Nicole Scherzinger.  Fox, 8:00 - 9:00pm, ET

Person of Interest - "Number Crunch" - The machine mysteriously spits out four Social Security numbers instead of one, as Detective Carter deals with the aftermath of her encounter with Reese and Finch.  CBS, 9:00 - 10:00pm, ET

Beavis and Butthead - "Used Car / Bounty Hunters / Time Machine / Massage" - With two fresh half-hours of the duo's exploits, tonight Beavis and Butthead destroy a used car, adopt the profession of a reality TV bounty hunter, attempt to prevent their teacher's birth when they believe they've gone back in time, and open up their own massage parlor.  MTV, 10:00 - 11:00pm, ET

Burn Notice - "Fail Safe" - Its fifth season finale, Sam and Fiona run reconaissance as the team reaches a breaking point with Anson's sinister motives, while Pearce puts Michael on his biggest CIA mission yet.  USA, 10:00 - 11:00pm, ET

Impractical Jokers - "Pilot" - Four childhood friends put each other through awkward and bizarre hidden-camera pranks, with the loser at episode's end forced to attempt the most humiliating challenge possible, this week behind food service counters, in Times Square, and a warehoue store.  truTV, 10:00 - 10:30pm, ET

It's Always Sunny in Philadelphia - "The High School Reunion, Part 2:  The Gang's Revenge" - The second half of the Always Sunny gang's seventh season finale, the gang goes through with their plan to restore their high school images in front of their former classmates   FX, 10:00 - 10:31pm, ET

The Mentalist - "Fugue in Red" - Jane gets attacked during the hunt for a firefighter's killer, losing his memory and reverting to his former con man identity in the process.  CBS, 10:00 - 11:00pm, ET

The League - "The Guest Bong" - Pete's new girlfriend wants to help him with his line up; Kevin's past at the DA's office has him running scared, and auto-correct gets everybody in trouble.  FX, 10:31 - 11:01pm, ET

What will YOU be watching?