Chapter 1 (Legion)

"Chapter 1" is the pilot and first episode of the first season of the American surrealist superhero thriller television series Legion, based on the Marvel Comics character David Haller. The episode follows David, who believes himself to have schizophrenia until he is interrogated by government agents who think he may be the most powerful mutant alive. The episode was written and directed by series creator Noah Hawley.

Dan Stevens stars as David, alongside series regulars Rachel Keller, Aubrey Plaza, Jeremie Harris, Amber Midthunder, Katie Aselton, and Jean Smart. FX ordered a pilot for Legion in October 2015, with Hawley attached. He structured the episode to reflect David's confused headspace, and to explore issues of mental illness. The episode was filmed in Vancouver and nearby soundstages, with elaborate sequences and in-camera practical effects worked into the 21-day filming schedule. These included several montages, a Bollywood dance number, and a complicated single take action sequence. The practical effects were digitally augmented by Folks VFX.

"Chapter 1" originally aired on FX on February 8, 2017, and was watched by 3.59 million viewers within a week of its release. The episode was praised by critics for its inventive storytelling and visuals, distancing itself from other superhero stories, as well as the performance of Stevens and Hawley's direction. However, some critics found the unreliable narrator aspect too confusing.