Warning! Spoilers ahead for Young Sheldon 6, episode 15.With George's cheating scandal looming on the horizon, Young Sheldon season 6 may have just explained Mary's awful behavior in The Big Bang Theory. Sheldon's mom was a fixture in The Big Bang Theory, functioning as a regular guest star. She often visited his son in Pasadena, California, especially when he was having some difficulties in earlier seasons. Later on, however, Sheldon would return home to check up on her house in Texas. Throughout her appearances in The Big Bang Theory, Mary was relentless in criticizing her late husband, George, giving the Cooper patriarch a bad image — something that Young Sheldon continues to contradict.
