“The Big Bang Theory,” about a group of nerdy friends ran from 2007 to May 2019. The first spinoff, “Young Sheldon,” ran for seven seasons and concluded last year. “Georgie & Mandy’s First Marriage,” will debut its second season in the fall. Warner Bros. and HBO Max are owned by CNN’s parent company.

Sheldon Cooper is a pretty consistent character across The Big Bang Theory, which is probably why Jim Parsons liked a departure episode so much.

Ever been watching The Big Bang Theory and wondered where you've seen one of the actors before? We've compiled a list to help place a name to the face.