WATCH: Preview Sunday's 'Game of Thrones' Episode with This Video

We’re just two episodes deep in Game of Thrones season 7, but story lines are already coming together like crazy.

Winter is here, and the demand for dragonglass is about as high as Jorah would need to be to continue to let Sam treat his greyscale. Seriously. Ol’ boy Ned liked to warn us, but winter’s not coming—it’s here. And the discovery of dragonglass at Dragonstone is setting episode 3 up for one of the most anticipated meetings of the series: the one between Jon Snow, King of the North, and Daenerys Targaryen, Mother of Dragons/Breaker of Chains.

Below, find out what you can expect from episode 3 on Sunday!