Young Sheldon 3x21 "A Secret Letter and a Lowly Disc of Processed Meat" Season 3 Episode 21 Promo trailer HD (Season Finale) - Sheldon discovers that Mary's been keeping a secret about his future. Also, Meemaw is furious when she learns Dale fired Georgie, on YOUNG SHELDON, Thursday, April 30th on CBS.<br /><br />Young Sheldon 3x21 Promo/Preview "A Secret Letter and a Lowly Disc of Processed Meat" (Season Finale)<br />Young Sheldon Season 3 Episode 21 Promo<br />Young Sheldon Season 3 Season Finale Promo<br />Young Sheldon 3x21 Promo "A Secret Letter and a Lowly Disc of Processed Meat" (HD) Season Finale<br /><br />#YoungSheldon<br /><br />» Watch Young Sheldon Thursdays at 8:00pm on CBS<br />» Starring: Iain Armitage, Zoe Perry, Lance Barber, Raegan Revord, Montana Jordan, Jim Parsons
