Reign 3×09 “Wedlock” – Mary (Adelaide Kane) becomes suspicious of Prince Don Carlos’ (guest star Mark Ghanimé) true condition and relies on Gideon (Ben Geurens) to help her uncover the truth. Elizabeth (Rachel Skarsten) makes a shocking discovery which could change the course of her reign over England and forces Dudley (Charlie Carrick) to make a tough decision. Meanwhile, Narcisse (Craig Parker) forces Claude (Rose Williams) to marry someone of his choosing, against her wishes. Megan Follows, Anna Popplewell, Torrance Coombs, Celina Sinden and Jonathan Keltz also star. Norma Bailey directed the episode written by Wendy Riss and Drew Lindo (#309). Original airdate 1/15/2016.