Adelaide Kane Queen Mary Actor Megan Follows Queen Catherine Actor Rachel Skarsten Queen Elizabeth Actor Celina Sinden Greer Actor Craig Parker Narcisse Actor Rose Williams Princess Claude Actor Ben Geurens Gideon Blackburn Actor Dan Jeannotte James Actor Jonathan Goad John Knox Actor Spencer MacPherson King Charles Actor Will Kemp Lord Darnley Actor Steve Lund Luc Narcisse Guest Star Michael Therriault Aloysius Castleroy Guest Star Nola Augustson Lady Lennox Guest Star Chad Connell Lord Taylor Guest Star Claire Hunter Emily Knox Guest Star Laurie McCarthy Executive Producer Frank Siracusa Executive Producer John Weber Executive Producer Brad Silberling Executive Producer Gretchen J. Berg Executive Producer Aaron Harberts Executive Producer Michael McGowan Director Robert D. Doty Writer