|Original airdate:||March 1, 2017|
|Previous Episode:||"Chapter 3"|
|Next Episode:||"Chapter 5"|
"Chapter 4" is the fourth episode of the first season of Legion.
To be added
- Dan Stevens as David Haller/Legion
- Rachel Keller as Sydney "Syd" Barrett
- Aubrey Plaza as Lenny Busker
- Bill Irwin as Cary Loudermilk
- Nicky Lee Evans as Cary (Age 8)
- Jeremie Harris as Ptonomy Wallace
- Amber Midthunder as Kerry Loudermilk
- Katie Aselton as Amy Haller
- Jean Smart as Melanie Bird
- Jemaine Clement as Oliver Bird
- Mackenzie Gray as The Eye
- Scott Lawrence as Dr. Henry Poole
Continuity and References to the Earth-10005
To be added
- The poem that Oliver recites is "California Supermarket" by Allen Ginsberg.
- When they are in the astral plane, Oliver Bird asks David if he likes beatnik poetry. The poem he recites in part is "A Supermarket in California" by well-know beat-poet Allen Ginsberg.
- Kerry Loudermilk wears a blue pantsuit and brown trenchcoat, similar to James Arthur Madrox, aka Multiple Man, in the X-Factor comics. Multiple Man can create multiple versions of himself, whereas Kerry and Cary Loudermilk are two different people that share the same body.
- First appearance of the Astral Plane, which frequently appears in the Marvel Universe, especially X-Men.