Watch a major 'Game of Thrones' reveal from Comic-Con

Spoiler alert! If you don't want any hints regarding upcoming episodes of Game of Thrones, stop reading now.

Oh, Melisandre!        

Expect a dramatic return of the exiled Red Woman (Carice van Houten) in an upcoming Game of Thrones episode that features a meeting with dragon queen Daenerys Targaryen (Emilia Clarke).

That's a major reveal from a one-minute trailer played at the San Diego Comic-Con Friday during the panel for Thrones, which premiered the first of seven Season 7 episodes Sunday. 

In the scene, the mysterious Melisandre cryptically tells Daenerys, "I believe you have a role to play … as does another."

Could that "another" be Jon Snow (Kit Harington), who appears to be a Targaryen, too, according to one off Three-Eyed Raven Bran Stark's visions from last season?

At another point in the clip, King in the North Jon suggests a potential alliance with Daenerys to defeat the Night's King, and one of his followers says, "A Targaryen cannot be trusted."

That could become an issue if and when Jon's forces learn he is the son of Lyanna Stark and, as it appears, Rhaegar Targaryen. 

Regardless, Daenerys may not be in the mood for sharing, as the clip opens with her saying, "I was born to rule the Seven Kingdoms. And I will," as one of her dragons swoops by.

And Queen Cersei (Lena Headey) isn't going to sit around. She's amassing a big army to take on Daenerys, who "will destroy the realm" if not stopped.

Season 7 continues Sunday at 9 ET/PT on HBO.