Young Sheldon 4x15 A Virus Heartbreak and a World of Possibilities - Promo Trailer HD - Young Sheldon 4x15 "A Virus, Heartbreak and a World of Possibilities" Season 4 Episode 15 All Sneak Peeks - Sheldon is caught in a moral dilemma when offered a bootleg copy of a computer game he can’t afford. Also, Mary and Meemaw take Brenda (Melissa Peterman) out for girls’ night while George Sr. and the guys watch Billy, and Missy asks Georgie to take her and Marcus (London Cheshire) on a secret date, on YOUNG SHELDON, Thursday, April 22nd on CBS.