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Sheldon feels lost after one of his favorite TV shows gets canceled too soon and Amy tries to help him get over his compulsive need for closure. Meanwhile, Raj discovers a secret about his new love interest, Lucy, on THE BIG BANG THEORY, Thursday, April 25th on the CBS Television Network. Pictured left to right: Kaley Cuoco and Johnny Galecki Photo: Monty Brinton/CBS © 2013 CBS Broadcasting, Inc. All Rights Reserved.