How Amy's 'girl crush' on Penny helped The Big Bang Theory's breakout character grow beyond Sheldon's shadow.
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According to creator Chuck Lorre, Amy's friendship with Penny was crucial in allowing the character to evolve from just 'Sheldon's girlfriend' into a complex, fully-realized woman.
Mayim Bialik, who played Amy, said the on-screen chemistry between her character and Kaley Cuoco's Penny was 'immediate' and 'so natural' that it quickly became a fan-favorite storyline.
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Chuck Lorre, Mayim Bialik, Kaley Cuoco, The Big Bang Theory, The Big Bang Theory