Tom Hopper as Number One/ Luther Hargreeves
Spaceboy
David Castañeda as Number Two / Diego Hargreeves
The Kraken
Emmy Raver-Lampman as Number Three / Allison Hargreeves
The Rumour
Robert Sheehan as Number Four / Klaus Hargreeves
The Séance
Aidan Gallagher as Number Five
The Boy
Justin H. Min as Number Six / Ben Hargreeves
The Horror
Elliot Page as Number Seven / Vanya Hargreeves
The White Violin
Karen Gillan as Number Eight / Agatha Hargreeves
Plant Girl