The half-hour, single-camera sitcom, created by Big Bang’s Chuck Lorre and Steven Molaro, will follow Sheldon as he goes through his formative years, beginning at the age of nine, living with his family in East Texas and then attending high school.
Who will be playing young Sheldon? Big Little Lies star Iain Armitage, who will take on the 9-year-old version of the character.
"He's wonderful," the 43-year-old actor said of Armitage, 9. "So many kids sent in [tapes] and it was really overwhelming. But this one little guy was really special."
"Chuck Lorre, Steve Molaro are really heading it but they're always really sweet about asking, 'What would you think?' and I'm like, 'I think it's great,'" Parsons said of casting his role. "I kind of don't want to get in the way too much because whoever the kids is has to do his own thing. You know what I mean? If it's going to be special it has to be related to what's going on but also its own creature, you know? I'm excited about it though."
The Big Bang Theory airs Thursdays at 8 p.m. ET/PT on CBS.
For more on the Big Bang Theory spinoff, watch the video below.