The Doctor is facing his "darkest hour" in season six of Doctor Who, according to this new trailer. Secrets will be revealed, cool helmets will be worn, and decisions will be made.

The trailer includes scary monsters, a sad/spooky clown, and Amy shooting a gun — at the Doctor? It's hard to say. And the Doctor makes a huge pronouncement: "I've been running my whole life. Now it's time to stop." This season looks like it could be an amazingly cool story.