Sheldon and Amy were the only characters from The Big Bang Theory to be seen on Young Sheldon but it was Penny, not Leonard, ...

At that, we flash forward to present day, with Amy scolding Sheldon for making that claim ... it just ended up being the most practical way to do so. "They don't take place in the same time ...

In PEOPLE's exclusive sneak peek, Amy Farrah Foweler (Bialik) recalls how Sheldon Cooper (Parsons ... If you can't cast that part, you just don't do the show." As the cast films its series ...