Young Sheldon Jim Parsons. Jim Parsons doesn't want his younger counterpart to care too much about other people. Jim Parsons and Young Sheldon star Iain Armitage are like two peas in a pod.

Prequel spin-off Young Sheldon has now received its first trailer; though its single-camera, laugh-track-free format means the show may feel stylistically very different from its origins Just smaller and cuter, as Jim Parsons' Sheldon is seen in his younger form, as played by Big Little Lies star Iain Armitage. - Jim Parsons was so enthusiastic when discussing his upcoming "Big Bang Theory" prequel on Monday that he got somewhat tongue-tied.
Jim Parsons: From the very start, and it's the reason Iain's playing this part is, he understood what he's reading as soon as he reads it.
Jim Parsons (aka Sheldon Cooper) has revealed that there is an extremely cute reason why the actor who plays his younger self on Young Sheldon is allowed to do the show. Iain Armitage and Jim Parsons, both who play Sheldon Cooper, on two different shows: "Young Sheldon" and "Big Bang Theory."FilmMagic. The actors play the same character, Sheldon Cooper from RELATED: First Look at 'Big Bang Theory' Spinoff 'Young Sheldon' -- See the Pics!