The Young Sheldon cast helps to create the story of Sheldon Cooper's childhood with his family in Texas as he began his journey as a young genius. To capitalize on the popularity of The Big Bang Theory, the sitcom's first spin-off premiered in 2017. The shows aired back-to-back for two years, but since its parent series wrapped up its run in 2019, Young Sheldon remained standing on its own. The events of Young Sheldon take place around two decades before the beginning of The Big Bang Theory.

While Sheldon Cooper might be the show's main focus, the sitcom has proven its own strong ensemble with characters who appeared on The Big Bang Theory as older versions of themselves, those who were only mentioned, and some who are entirely new creations in this prequel show. Young Sheldon season 7 marked its end, although it won't be the last time to see this talented cast together.