Yannick Bisson Detective William Murdoch Actor Thomas Craig Inspector Thomas Brackenreid Actor Helene Joy Dr. Julia Ogden Actor Lachlan Murdoch Henry Higgins Actor Jonny Harris Constable George Crabtree Actor Daniel Maslany Detective Llewellyn Watts Actor Clare McConnell Effie Newsome, Effie Crabtree Actor Paul Sun-hyung Lee Inspector Albert Choi Actor Shanice Banton Violet Hart Actor Mark Caven Chadwick Vaughan Actor Benjamin Blais Guy Pascoe Actor Sally Lindsay Nigella Fletcher Actor Cyrus Lane Rupert Newsome Actor Ali Badshah Mr. Lemiuex Actor Paulino Nunes Frank Bale Actor Bea Santos Louise Cherry Actor Kris Siddiqi Parker Crosby Actor Brian Bisson Mr. Mark Gilbert Actor Bruce Beaton Henry Calder Actor Liam Green Jeb Fisher Actor Maureen Jennings Writer Peter Mitchell Writer Noelle Girard Writer Giacomo Gianniotti Director Jenny Lee Writer Keri Ferencz Writer, Co-Executive Producer, Producer Cal Coons Writer Jayson Clute Director Elsbeth McCall Director Vanessa Matsui Director Craig Wallace Director Alexandra Zarowny Writer Nick West Writer R.B. Carney Writer