Tatiana Maslany Sarah, Beth Actor Jordan Gavaris Felix Actor Dylan Bruce Paul Actor Kevin Hanchard Art Actor Evelyne Brochu Delphine Actor Ari Millen Mark, Rudy Actor Kristian Bruun Donnie Actor Maria Doyle Kennedy Mrs. S Actor Tom McCamus Dr. Nealon Guest Star Nicholas Campbell Willard Finch Guest Star Josh Vokey Scott Guest Star Kristin Booth Bonnie Johanssen Guest Star Zoé De Grand Maison Gracie Johanssen Guest Star Amanda Brugel Marci Coates Guest Star Kyra Harper Dr. Virginia Coady Guest Star Kathryn Alexandre Alexis Guest Star Ivan Schneeberg Executive Producer David Fortier Executive Producer