TMDb/Georgie & Mandy's First M Celebrity Iain Armitage addresses returning as Sheldon in Georgie & Mandy's First Marriage after its season 3 renewal. May 4, 2026 AceShowbiz - Young Sheldon's star, Iain Armitage, recently commented on the possibility of reprising his role in the spinoff series Georgie & Mandy's First Marriage, following its season 3 renewal on CBS. At the conclusion of Young Sheldon, the character Sheldon Cooper, portrayed by Iain Armitage, left his Texas hometown to pursue post-graduate studies at Caltech.