Cameron Britton as Hazel
Tom Hopper as Luther Hargreeves
David CastaƱeda as Diego Hargreeves
Robert Sheehan as Klaus Hargreeves
Emmy Raver-Lampman as Allison Hargreeves
Mary J. Blige as Cha-Cha
Elliot Page as Vanya/Viktor Hargreeves
Aidan Gallagher as Number Five
Justin H. Min as Ben Hargreeves
Colm Feore as Sir Reginald Hargreeves
Kate Walsh as The Handler
Jordan Claire Robbins as Grace
Sheila McCarthy as Agnes Rofa
Ritu Arya as Lila Pitts
Marin Ireland as Sissy Cooper