Aidan Gallagher

Number Five

Elliot Page

Vanya Hargreeves / Number Seven

Tom Hopper

Luther Hargreeves / Number One

Emmy Raver-Lampman

Allison Hargreeves / Number Three

Robert Sheehan

Klaus Hargreeves / Number Four

David Castañeda

Diego Hargreeves / Number Two

Mary J. Blige

Cha-Cha

Cameron Britton

Hazel

Colm Feore

Sir Reginald Hargreeves

Adam Godley

Pogo (voice)

John Magaro

Leonard Peabody