The moment Mary Cooper made her entrance in the very first season of The Big Bang Theory, she became a popular character thanks to her hilarious religious comments and always being there for Sheldon.

However, fans couldn't help but notice how bitter she always appeared to be in and wondered why she was that way. Well, the spin-off prequel shows us a different side to Mary and finally explains what was behind her bitterness whenever she came around in the sitcom.

Sheldon Cooper's mother, Mary Cooper, was introduced to the viewers as an overtly devout Christian from East Texas.

Her Christian fanaticism makes her irrationally overprotective at times, and often leads her to deny herself and her family many things to look like a good Christian. Though she's undoubtedly a witty woman who has raised a boy-genius, we were still left wondering what made her more bitter in

than in , where she was less stuck in her ways.

At last, seasons 5 and 6 of shed some light on her life and explained a few important things. Mary's relationship with her kids is far from ideal, and there have been times when fans thought she seemed selfish and hypocritical. However, as it turns out, she had her own struggles, and was, in fact, going through a lot.

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