Mary's Life Will Forever Be Changed In Tonight's New 'Reign'

Mary and Elizabeth look like they’re both having conversations that will change their entire lives in these new stills from Reign.

In tonight’s episode, titled “A Bride. A Box. A Body.,” Mary (Adelaide Kane) pursues her quest for justice as she launches a counterattack on her conspirators — and Bothwell (Adam Croasdell) is right by her side.

Meanwhile, Elizabeth (Rachel Skarsten) suffers a major setback that turns her world upside down.

Adam teased on his Instagram of the episode, “Bothwell and Darnley side by side? What’s up with that?”

Watch the sneak peek below and tune in TONIGHT @ 9PM ET/PT on The CW.