Young Sheldon gives us a glimpse at what some of our favourite characters from Big Bang Theory looked and behaved like when they were younger, and as a result, there are some pretty major transformations. The showrunners for Young Sheldon did a great job casting as the younger versions of the characters really resemble their older counterparts, with Mary even being played by the daughter of the actress who played her in Big Bang Theory!

Sheldon dressed like an adult with a pension fund and 8pm bedtime when he was younger, but by the time we see him as an adult in The Big Bang Theory, he's reverted to a more childlike way of dressing with comic themed shirts and wearing pyjamas during the daytime.

When we see Missy in Big Bang Theory she certainly looks a lot different than she appears in Young Sheldon, with Raj, Leonard and Howard all attempting to ask her out.
But in Young Sheldon, she's just your classic teenager by the end of the series who is trying to deal with the devasting loss of her dad's death.
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