MARY REALIZES SHE MUST MARRY FOR THE GOOD OF SCOTLAND — As Mary (Adelaide Kane) and Catherine (Megan Follows) deal with the aftermath of Prince Don Carlos’ (guest star Mark Ghanimé) accident, Mary realizes that she will have to marry for the good of her country and not follow her heart. When Catherine is accused of poisoning Francis (Toby Regbo), Lola (Anna Popplewell) is shocked when Mary thinks Narcisse (Craig Parker) framed Catherine in order to become Regent of France. Torrance Coombs, Ben Geurens, Celina Sinden, Rachel Skarsten, Charlie Carrick, Rose Williams and Jonathan Keltz also star. Lee Rose directed the episode written by Gretchen J. Berg and Aaron Harberts (#308). Original airdate 1/8/2016.