Natalia Dyer as Leo

Subject A57 - The Anchor

Astrid S as Dawn

Subject A58 - The Roots

Georgie Henley as Michelle

Subject A59 - The Hermit

Amandla Stenberg as Ella

Subject A60 - The Corpse

Nick Robinson as Dave

Subject A42 - The Dreamer

UNKNOWN as the Violet Girl

Subject number unknown

Additional Cast

Thomas Brodie-Sangster as Newt

Ki Hong Lee as Minho

Will Poulter as Gally

Aml Ameen as Alby