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Tonight on The Big Bang Theory (7 p.m., CBS/Ch. 2), the women's trip to Las Vegas is short-circuited, and they end up playing Dungeons & Dragons with the guys. And Amy and Sheldon's relationship takes a surprising turn during the game.It's very funny stuff. And DO NOT miss the segment just before the closing credits.Elsewhere on TV ...Wipeout (7 p.m., ABC/Ch. 4): This goofy game show returns.Community (7 p.m., NBC/Ch. 5): Jeff contemplates graduation. (Season finale - and we don't know yet if there will be another season.)American Idol (7 p.m., Fox/Ch. 13): Another contestant is eliminated.The Vampire Diaries (7 p.m., CW/Ch. 30): Ghosts appear during a violent windstorm.Two and a Half Men (7:30 p.m., CBS/Ch. 2): Walden goes on a date with a 22-year-old (Hilary Duff), but he's more interested in her grandmother (Marilu Henner). (Season finale - and this show has already been picked up for next season.)Person of Interest (8 p.m., CBS/Ch. 2): The machine breaks down. (Season finale - and this show has already been picked up for next season.)Grey's Anatomy (8 p.m., ABC/Ch. 4): A superstorm is headed for Seattle.The Office (8 p.m., NBC/Ch. 5): Everyone prepares for the premiere of the documentary.Glee (8 p.m., Fox/Ch. 13): New Directions competes at sectionals. (Season finale - and this show has already been picked up for the next two seasons.)Beauty and the Beast (8 p.m., CW/Ch. 30): Cat and Vincent go on a date.Men at Work (8 and 10 p.m., TBS): Tyler dates a single mother.Elementary (9 p.m., CBS/Ch. 2): Sherlock accepts a case from a man who claims to be Moriarty.Scandal (9 p.m., ABC/Ch. 4): Cyrus is at the center of a huge scandal.Anger Management (10 and 10:30 p.m., FX): Charlie and his father coach a baseball team.