Reign 3×06 “Fight or Flight” – Mary (Adelaide Kane) realizes she must help Catherine (Megan Follows) in her quest to become regent, even at the risk of hurting the alliance with Scotland. Claude (Rose Williams) is determined to help Leith (Jonathan Keltz) marry while Elizabeth (Rachel Skarsten) struggles with the prospect of losing Dudley (Charlie Carrick). Toby Regbo, Torrance Coombs, Craig Parker, Anna Popplewell, Celina Sinden and Ben Geurens also star. Charles Binamé directed the episode written by Lisa Randolph (#306). Original airdate 11/20/2015.