Ella Summer Purnell is an English actress best known for her roles as Jackie in the Showtime drama series Yellowjackets, Jinx in the Netflix animated television series Arcane, and Gwyn in the Paramount+/Nickelodeon animated series Star Trek: Prodigy. She is also known for her roles in the films Miss Peregrine's Home for Peculiar Children (2016), Churchill (2017), and Army of the Dead (2021).