Armstrong, who is just 15 (Gellar was 19 when she played 16-year-old Buffy Summers in season 1) starred in American Horror Story: Red Tie before joining the cast of Disney's Star Wars: Skeleton Crew as part of the ragtag group of kiddos who get lost in the galaxy. She's set to star alongside Ethan Hawke on the new FX drama, The Lowdown.

Searchlight and Hulu's Buffy the Vampire Slayer sequel series has cast its lead, with Skeleton Crew star Ryan Kiera Armstrong set to play the new