The season is defined by the high-stakes chess match between (Adelaide Kane) and Elizabeth I (Rachel Skarsten).
: For the first time, the two queens actively attempt to assassinate each other.
While Mary is away, Catherine de' Medici (Megan Follows) struggles to maintain control in France. Season 4 – Reign - Rotten Tomatoes Reign - Season 4
: A "warm-hearted bad boy" and loyalist who eventually wins Mary's heart, though their connection leads to further political controversy.
: Mary looks to secure the English throne by marrying Lord Darnley, a nobleman with his own blood-claim to Elizabeth's crown. The season is defined by the high-stakes chess
: Mary's second husband. Their marriage is far from blissful, plagued by Darnley's violent nature and his secret alliances with Elizabeth and the Vatican.
: Mary gives birth to her son, the future King James, fulfilling a prophecy of a ruler who would eventually unite Scotland and England. 🏰 Chaos at the French Court Season 4 – Reign - Rotten Tomatoes :
: Mary remains fueled by a desire for revenge after Elizabeth ordered the execution of her lady-in-waiting, Lola. 💍 New Alliances and Betrayals