If this new Doctor Who trailer is any indication of what’s to come, season nine will be dark and filled with heart-pumping drama.

The BBC America series premiered the new trailer at Comic-Con in San Diego yesterday to an excited crowd. As Mashable reports, the stars also took to a panel to talk about the new season but revealed very little.

Here’s what we do know, or at least can speculate about, based on that report: the Doctor’s nemesis Missy returns, there are vikings on a spaceship, and they get a drop-in from a very special guest of another immensely popular series.

Game of Thrones‘ Maisie Williams shows up in the trailer and says, “What took you so long, old man?”

Doctor Who premieres Sept. 19 on BBC America.

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