The CW makes it very clear in the first trailer for Reign Season 3:
That battle for power than dominated the drama over its first two gripping seasons? It will reign on this fall. (That’s the network’s pun, not ours.)
In the first trailer for Season 3, we see that Queen Elizabeth is still very much determined to dethrone her (“My sweet cousin Mary will suffer my wrath”), while evil Catherine remains by her side.
And with even with ailing Francis offering to help “as long as [he] can,” Mary is well aware she “can’t take on two queens” and live to tell the tale.
So the question is this, heading into the October 9 premiere: Who else can she turn to for help?!?