Young Sheldon season 6, and its Missy (Raegan Revord) storyline showcased just how much The Big Bang Theory destroyed Sheldon's sister. After Mary (Laurie Metcalf), Sheldon's (Jim Parsons) twin sister Missy was the second Cooper to appear on The Big Bang Theory, visiting the socially-inept genius in Pasadena. Despite her limited involvement in the geek-centric sitcom, however, her cameos effectively established her as a character. Lately, however, Young Sheldon is making it increasingly difficult to believe that its version of Missy grew up to be the version that appeared on The Big Bang Theory.

Instead of focusing its storytelling on Sheldon, Young Sheldon diversified its storytelling and also gives ample focus on the rest of the Cooper family. That includes Sheldon's sister Missy, who has become a fan-favorite in the series. While she isn't as academically gifted as her twin brother, she excels in other life aspects. She is witty, charming, and social. Missy is also emotionally mature for her age; she provided support to all of her family members as they dealt with their respective woes in the Young Sheldon season 5 conclusion.

The Problem With Missy After Young Sheldon

Although Sheldon is the genius in the family, Young Sheldon season 6, episode 2 floated the idea that Missy is intellectually gifted as well. In an effort to land a part-time job at the local comic book store, Missy impressed the manager by recalling Sheldon's explanation about the X-Men, word per word. This means that Sheldon's sister also the great memory retention like her brother. Between this innate skill and her ingenuity, not to mention her great social skills, it's difficult to imagine that she ends up being the least successful Cooper sibling as established on The Big Bang Theory.

Missy only appeared twice on Big Bang Theory; first in season 1, and then a whole decade later in season 11 in time for Sheldon's wedding to Amy (Mayim Bialik). In her final cameo, it was revealed that Sheldon's sister was on the brink of separation from her husband, hence why she was unhappy about being accidentally pregnant with their second child. Thanks to older Sheldon's narration on Young Sheldon, it has been revealed that ultimately, Missy found her happiness as she eventually gets re-married and ends up having more kids.

Older Sheldon doesn't get into specifics about his sister's fate, although there are theories that she may have ended up with Raj (Kunal Nayyar) after the pair reconnected during Sheldon and Amy's wedding.

Young Sheldon season 5 sidelined Missy, relegating her to a supporting character rather than giving her a compelling arc. That changed in season 6, especially as she and Sheldon are now both teens, opening up a lot of narrative opportunities for her character. So, even if Young Sheldon can't change the trajectory of her life because of The Big Bang Theory, Sheldon's sister can have a great run on the prequel spin-off.

Young Sheldon Season 6 Only Makes Missy A Better Character

In Young Sheldon season 6, the show has definitely improved the storyline with Missy, as Shelton's sister has enjoyed an improved role. However. this also backs up the argument that Big Bang Theory really messed up when revealing what Missy was like in the future. After barely appearing in season 6, she was back to a full-time character in the sixth season. A lot of what really makes Missy great in the season is that she is becoming more aware of what her family is going through, and she specifically realizes how others are viewing them, even if Sheldon doesn't see it clearly himself.

However, there are a few moments in the season that might explain why Missy never appeared to be very smart, or a very good character at all on Big Bang Theory.

This was the season where Sheldon and Missy began to squabble more, and it was clear throughout that she didn't want Sheldon at home anymore. She was starting to rebel and knew that he was going to be there to stop her, and she also began to really feel neglected by her mother all season long, often feeling Sheldon was always the prized child.

In season 6, Missy is who really worked hard to convince Sheldon to never give up hope and accept his admission to the summer program in Germany. However, it wasn't because she was being a good sister. Instead, Missy just wanted Sheldon gone. It has become the norm that Sheldon's sister has much better social skills than him, and that she can use them to manipulate him and make him do what she wants him to do - even without him even knowing it. Young Sheldon has shown that it is possible Missy was never as dumb as Big Bang Theory made her appear, and has been playing Sheldon all along.