One of the last shows based on a Marvel character to actually air on television, Legion fared significantly better than most of the others on this list. That might have something to do with its ties to the X-Men franchise or the fact that it was on FX instead of one of the big five networks, but regardless, it had a pretty straightforward run of three seasons - telling a story that was anything but straightforward.
Where to begin with the complexities involved in Legion's storytelling? Let's start with the main character, David Haller, who is the mutant son of Charles Xavier diagnosed with schizophrenia. Throughout the course of the first season, Haller realized that there was more to his story than he thought and eventually came to terms with his abilities, all against the backdrop of a mental health facility. Dan Stevens was mesmerizing to watch in the role while the writing, particularly how well it used the unreliable narrator device to highlight Haller's POV of the world, was absolutely exquisite.
Legion had a pretty short run but it told one heck of a story and it deserves far more recognition for doing so. This was a show that pushed boundaries and made us think in a way that few of the shows on this list really have. And that should not be forgotten about.