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 Adam Godley Pogo Actor Millie Davis Claire Hargreeves Actor Victoria Sawal Jennifer Actor Liisa Repo-Martell Abigail Hargreeves Actor George Tchortov Quinn Actor Vinessa Antoine Loretta Actor Mike Richardson Executive Producer Keith Goldberg Executive Producer Beau Bauman Executive Producer Jesse McKeown Executive Producer Scott Stuber Executive Producer Paco Cabezas Director