A new clip for Georgie & Mandy’s First Marriage teases Young Sheldon star Raegan Revord’s return as Missy in episode 2. The retro sitcom-style series follows Georgie and Mandy’s journey as they move into Mandy’s parents’ house after getting married. Missy is Georgie’s younger sister and Sheldon’s twin in Young Sheldon, during which she establishes a relationship with Mandy when she became pregnant with Georgie’s child.