Amy scares the Doctor around a corner, explaining that van Gogh's snoring is driving her crazy. They buy him a courtyard full of sunflowers, to inspire him or something, and feed him breakfast. Vincent on sunflowers, and this is awesome: "It's not that I don't like them. I find them complex. Always somewhere between living and dying. Half-human, as they turn to the sun. A little disgusting. But, you know, they are a challenge." You could build a whole episode around that little speech. Maybe at some point they did. Inside, the Doctor shows him the creature -- "...The eyes, without mercy" Vincent nods -- which is called a Krafayis.
Their deal is that they travel in packs, through space, scavenging. When one gets left behind, they don't come back, because they are a brutal race. There is a stigma. So all around the universe there are these merciless, utterly abandoned Krafayis singletons, who kill and kill until they are killed, which doesn't happen because they are invisible. Which is all quite interesting because that's so one-sided -- like the one-dimensional Silurian assholes -- that you wonder how on earth they're going to make any kind of point at all when they finally meet with it. Well, I'll tell you: They won't. There are so many awesome things about this episode, but one of them is not this. So just forget everything I just told you about the Krafayis, because none of it matters any more than the rules from "Blink" could have helped at the Byzantium.
The Doctor and Amy drag Vincent to the church, applying a little Bill & Ted logic to the situation, all about how since he painted the creature in the window of the church, let's go to the church. The Doctor is one Nervous Nellie today, and for once he'll tell you why: "The result of our trip could be the brutal murder of the greatest artist who ever lived. Half the pictures on the wall of the Musée d'Orsay will disappear. And it will be our fault."
But first, let's check in with Vincent's manic depression. Well, he's buried face-down in the bedclothes, so probably he's in a bad way. And yes, he is. And a very good actor is playing him, which means it's absolutely terrible. The Doctor offers to help, and he assures the Doctor that he cannot. "And when you leave -- and everyone always leaves -- I will be left once more with an empty heart, and no hope." The Doctor tells him there's always hope. "Your experience is incomplete," Vincent says darkly, before he begins to scream. "I know how it will end. And it will not end well."