Ever wondered how Sheldon Cooper got to be so, um, quirky? You'll soon find out. CBS says a Big Bang Theory prequel will premiere during the 2017-18 TV season, centering on Jim Parsons' character as a 9-year-old going to high school in Texas. Iain Armitage of Big Little Lies will star as the future theoretical physicist in Young Sheldon, while Parsons will narrate, reports the Los Angeles Times. Zoe Perry and Lance Barber will reportedly play Sheldon's parents, reports the Hollywood Reporter. Production on the pilot, to be directed by Jon Favreau, will begin this month.