With reporting by Josh Horowitz
But what we didn't know until Saturday (July 11), when Hiddleston, Chastain, and Mia Wasikowska stopped by our San Diego Comic-Con headquarters, was just how freaky it would be.
"It is a little freaky," he said. "Because it comes of the tradition of storytelling where the supernatural is explained in terms of emotional trauma, and so there is inherent freakiness involved."
Hiddleston went on to explain that this "inherent freakiness" is a staple of the gothic romance genre -- which any fan of Showtime's "Penny Dreadful" can already tell you.
"Gothic romance is about sexuality... the Victorians didn't talk about sex at all, so in a way, through ghosts, you could sort of express the taboo of sexuality," he concluded. "You could open your eyes to certain truths about yourself that maybe you didn't know. I think there's a theme running through the film about that, which I think is really great... it's romantic and scary at the same time."
"Crimson Peak" hits theaters on October 16, 2015.