His twin sister doesn't share his exceptional mind, but she has a much clearer vision of what life has in store for the young genius. Young Sheldon (TV Series 2017– ) cast and crew credits, including actors, actresses, directors, writers and more. Plot Summary | Add Synopsis. The show is consistently one of primetime's most watched comedies, and their second season finale was watched by just under 14 million total viewers. Jim Parsons, who plays the adult version of Sheldon on " The Big Bang Theory (2007)," narrates. Having grown up in Houston, and its northern suburb of Spring, he made his first stage appearance in a school play at the age of 6. His acting debut was in an episode of Law & Order: Special Victims Unit. Jim Parsons (II) Jim Parsons. Parsons then went on to study theater at the University of Houston. Iain Armitage is an American child actor. Ryan Stiles is the actor playing the dentist, Dr Bowers, in episode 20.
He also appeared in the films The Glass Castle (2017) and Our Souls at Night (2017). Raegan Revord, Actress: Young Sheldon. Iain Armitage, Actor: Young Sheldon. A born performer, Raegan Revord can currently be seen on the smash hit CBS comedy Young Sheldon, where she plays fan favorite "Missy Cooper," the sassy and brash twin sister to Sheldon. He is best known for Young Sheldon, a prequel to the sitcom The Big Bang Theory and the HBO miniseries Big Little Lies. From there he won a place on a two-year Masters course in classical theater at the University of San Diego/The Old Globe Theater, graduating in 2001.