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When the girls’ trip to Vegas falls through, the guys invite them to play Dungeons & Dragons, causing Sheldon and Amy’s relationship to take an unexpected turn, on THE BIG BANG THEORY, Thursday, May 9th on the CBS Television Network. Pictured left to right: Johnny Galecki, Kaley Cuoco, Mayim Bialik, Jim Parsons Photo: Monty Brinton/CBS ©2013 CBS Broadcasting Inc. All Rights Reserved