If you want to know what will happen in this episode: Leonard tries to keep Sheldon from overreacting when a past mistake comes to light, but Sheldon punishes Leonard by making him walk a mile in his shoes. Meanwhile, Penny confronts Raj's ex-girlfriend, Lucy.

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TBBT season 7 is a fantastic show to enjoy: The seventh season of the American sitcom The Big Bang Theory premiered on CBS on September 26, 2013 with two episodes back-to-back. On January 12, 2011, The Big Bang Theory was renewed for an additional three years, extending it through the 2013–14 season for a total of seven seasons. Production for the season began on August 14, 2013.

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Cast and characters information: Dr. Leonard Hofstadter, portrayed by Johnny Galecki, is an experimental physicist with an IQ of 173 who received his Ph.D when he was 24 years old. He shares an apartment with colleague and friend, Sheldon Cooper. He and Penny dated at one point during the series, but they broke up during season 3. They start dating again in season 5 though their relationship has been rocky since Leonard proposed to Penny in bed. Throughout season 6, Penny and Leonard became more comfortable as a couple with Leonard asking Penny to propose to him when she was ready.

Leonard and Sheldon are brilliant physicists, the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow CalTech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.