The original post: /r/television by /u/Loose-Tumbleweed-925 on 2026-05-09 01:08:35+00:00.
I would say Boy Meets World fits this category. It started out as a goofy sitcom about a kid and his family and gradually became a pretty heavy teen drama as the cast got older. Roseanne also started out lighthearted and got pretty emotional and heavy in later seasons.