Young Sheldon star Raegan Revord had to abide by one Big Bang Theory rule while she starred in the seven-seasons long prequel series as beloved character Misty Cooper. For the entire duration of ...

Raegon Revord played Sheldon's sister Missy for seven seasons on "Young Sheldon," and through all that time she never changed her hair. Well, that's not entirely true — sometimes she got to wear ...