Young Sheldon season 6, episode 20 changes Missy's The Big Bang Theory appearances for the worse.Like most of Sheldon's family, his sister was already an established character before Raegan Revord debuted the character in the prequel. After Mary, Missy was the second member of the clan to make a physical appearance on the geek-centric sitcom.
Despite her brief involvement in The Big Bang Theory, Missy clearly made her mark, which is proven by her continued popularity in the prequel.
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