All It Cost Her Reign : Season 4 Episode 16
TV-14 The CW 42m
Aired: June 16th, 2017 @ 9:00 PM EST on The CW
In the series finale, Mary changes the course of history with a decision she makes, and her perilous move for survival causes her to have a stunning realization. Meanwhile, Elizabeth steadies herself for war and becomes the instigator in Mary's demise.
