The season 5 finale of Young Sheldon centers on the titular character's fear of the future, caused by his parents' constant fighting and his twin sister's absence. His concerns are eased when Missy returns and re-emphasizes the importance of their relationship.
The episode also touches on Georgie's situation as an expectant father and how it affects Sheldon's studies. In addition, Sheldon's fear of growing up is highlighted by the appearance of his first pimple. Ultimately, the episode shows how important family relationships are to Sheldon's character development.
