Jeremy Slater Creator Steve Blackman Creator, Executive Producer Gabriel Bá Creator Elliot Page Vanya Hargreeves, Viktor Hargreeves Actor Tom Hopper Luther Hargreeves Actor David Castañeda Diego Hargreeves Actor Emmy Raver-Lampman Allison Hargreeves Actor Robert Sheehan Klaus Hargreeves Actor Aidan Gallagher Five Actor Justin H. Min Ben Hargreeves Actor Ritu Arya Lila Pitts Actor Colm Feore Sir Reginald Hargreeves Actor Nick Offerman Dr. Gene Thibedeau Actor Megan Mullally Dr. Jean Thibedeau Actor David Cross Sy Grossman Actor Millie Davis Claire Hargreeves Actor Martin Roach CIA Supervisor Actor Marqus Bobesich Eddy Actor Michael Dyson Jerry Actor Katharine King So Amy Actor James Wallis Gus Actor Mike Richardson Executive Producer Keith Goldberg Executive Producer Beau Bauman Executive Producer Jesse McKeown Executive Producer Scott Stuber Executive Producer Jeremy Webb Director