In the latest trailer for the final season of HBO's Game of Thrones, the battle lines are drawn as fan-favorites unite in order to take down the Night King. As Jon Snow (Kit Harington) and Daenerys Targaryen (Emilia Clarke) expand their legion against the White Walkers, we see Cersei (Lena Headey) hedging her bets and surely plotting how to keep the Iron Throne as everyone else does the dirty work for her.

But while we see our heroes prepare for their final stand against hordes of ice zombies, the trailer offers subtle clues indicating that the biggest threat to doesn't come in the shape of White Walkers or their icy overlord. This secret, sinister figure may actually be Sophie Turner's Sansa Stark.

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Over seven season, Sansa has drawn sympathy as the show's biggest victim. When she arranged the execution of Littlefinger, fans cheered as it presented her as more assertive, someone who learned from her naiveté and the mistakes her family made in the past. Now, it seems Sansa's determined not to repeat those errors, even if it means stabbing Jon in the back.

In Sansa's brief shots, there isn't much of an heroic air. At 0:45, she's pensively staring up at the dragons as they fly over the North, as if they're just as untrustworthy as the Lannisters. At 1:24, as Jon and Daenerys approach their two dragons to seemingly mount them, we see a look of scorn, derision and (dare we say) hatred, in Sansa's eyes. Now, her facial expression could well be reserved for something else that draws her contempt, and this could simply be clever editing to mislead us, but last season, Sansa wasn't a fan of Jon forming a coalition with a Targaryen. While Sansa may welcome Daenerys and her army to Winterfell at face value, it's unlikely she'll be embracing them too closely and sincerely.

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Remember, her father helped in the uprising against the Mad King Aerys, which installed Robert Baratheon as the usurper. All her life, she's known the Targaryens to be evil (something she already voiced about Daenerys), and the trailer indicates she isn't a fan of them as this power couple who's strolling in to save the day. More so, she's not likely to roll over and watch Daenerys take the throne Jon doesn't want if they win; not after the literal blood, sweat, tears and sacrifices the Starks made in the name of justice.

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But it's more than just restoring Stark pride for Sansa. The only surviving members of her bloodline are Bran (who's now the mystical Three-Eyed Raven) and Arya (who just wants to cross names off her kill-list). Jon is kin, but when the truth about him being a Targaryen comes out, Sansa may well view him in a different light. After all, that family was the catalyst for the cursed lives the Starks have endured. Sansa may use Jon and Daenerys to kill the Night King and remove Cersei before trying to turn Winterfell into the new King's Landing, or possibly even attempt to secure the throne for herself. Given the mentorship she endured from Littlefinger, and how she learned the cruel and strong survive when Cersei was her mother-in-law, it's safe to guess Sansa may be a little damaged. This might be her warped way of carrying out the vision her father had to protect the Seven Kingdoms; you can't put it past her to poison or literally put a knife in the backs of her current allies.

Jon isn't her sibling, after all, he's her cousin, and in her eyes, that's a big difference. At the trailer's 30 second mark, Bran says, "Everything you did brought you where you are now. Where you belong. Home," and we're graced with an epic shot of Winterfell as Jon brings in the cavalry. But while he may view Winterfell as a safe haven, Sansa may very well view Jon as an outsider, a pretender who raises the banner and blood of a lifelong Stark enemy.

A Sansa power play would also be a tremendous upswing for someone who was dehumanized by Ramsay Bolton, used as a puppet by Littlefinger when he had Joffrey and Tommen wed her. Ultimately, it would bring her story full-circle as a queen ready to rise above the unquantifiable amount of blood her family has spilled. She might end up thinking this throne is her right through duty and whether its the Wights or members of the Northern alliance, no one deserves to sit on it more than her. As this percolates through Sansa's mind, we don't know how this could affect Jon's mission as he embarks on achieving peace his own way -- through unity.

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We do know Sansa believes recrimination falls on the Targaryens as much as it does on the Lannisters, and to her, the alliance may end up ultimately being a smoke and mirrors affair to a long-term goal. Replacing Cersei, evolving from a wilted, groveling and forlorn figure, is looking like it's her endgame. Rather than decamp from Jon's army, Sansa's smart enough to play the waiting game, and she'll do so with no one suspecting her. Sadly, it could be a case that if she doesn't die a hero, she'll live long enough to see herself become the villain. But given the hell she's experienced, Sansa might end up being tougher than we all imagined, ready to cut all throats to rule the way she thinks Westeros ought to be ruled -- by one of its most loyal souls.

Season 8 of Game of Thrones, the show’s final season, will premiere April 14. It will feature six episodes with longer than usual runtimes. The HBO drama stars Peter Dinklage as Tyrion Lannister, Nikolaj Coster-Waldau as Jaime Lannister, Lena Headey as Cersei Lannister, Emilia Clarke as Daenerys Targaryen, Sophie Turner as Sansa Stark, Maisie Williams as Arya Stark and Kit Harington as Jon Snow.