Sometimes, when watching Game of Thrones, it's easy to forget that we didn't start at the beginning. The battle for the Seven Kingdoms is centuries old, punctured by periods of peaceful coexistence between the ruling Houses, but with discord always simmering away just beneath the surface.
In short, there's a lot we don't know — like what exactly happened when Rhaegar Targaryen took Lyanna Stark as his hostage. It was that act that triggered Robert's Rebellion, made rulers of the House Baratheon and wiped out most of the Targaryen bloodline, driving the two child heirs of the House into exile in Essos.
The details of the night of Lyanna Stark's death are important because they could have a huge impact on Daenerys Targaryen's attempt to return to Westeros and take back the Iron Throne — but first, let's talk about another woman on a mission.
Despite the many denials, it's borderline universally accepted at this point that Jon Snow will be returning in Season 6 — and not just as a corpse. But the most relevant question is not, "How?" but, "Why?"
Melisandre has the "how" part taken care of. As we saw from Thoros of Myr in Season 3, the Lord of Light has the power to grant resurrection when called upon. Thoros resurrected Beric Dondarrion six times, a fact that stunned even the Red Priestess herself.
The Season 6 trailer suggests that Ser Davos Seaworth (Liam Cunningham) will team up with Melisandre, despite their difficult history, in the common goal of resurrecting Jon Snow, with a little assistance from the Lord of Light.
But why bring Jon Snow back to life? Most of the key players in House Stark are long since dead. Let's run with the strong likelihood of Rhaegar Targaryen having raped Lyanna Stark whilst holding her hostage. Upon Ned Stark's arrival at the Tower of Joy, Lyanna is said to have died in her brother's arms, lying in a pool of blood, although the exact cause of death remains a mystery.
If Lyanna had died during labor, having just birthed the bastard son of Rhaegar, that would make Jon Snow a Targaryen. His blood would be that of the Houses of Fire and Ice. If Bran Stark's visions with the three-eyed raven allow him a glimpse into the circumstances of Jon Snow's birth, we might finally get confirmation that Ned Stark did indeed raise a bastard — it just wasn't his.
Of course, if Jon Snow really does have Targaryen blood — proven easily enough when you add dragons into the mix — he could have a claim as the true Targaryen heir, and that would spell serious trouble for Daenerys's bid to take back the Seven Kingdoms.
During an interview with Sky Atlantic, Cunningham hinted that George R. R. Martin had shared a secret with him. I believe that Ser Davos will discover the secret of Jon Snow's parentage in Season 6, and if that's not the biggest game-changer in Game Of Thrones history, I don't know what is.
Check out the trailer above for Season 6, which begins April 24 on HBO.