Sequels, prequels, reboots, remakes and franchise mergers are the meat of Hollywood's content-generating engine. From AvP to Rise of the Return of the Revenge of the Reinvented Reinstantiation, the modern cinema is all about rehashed revisionism. So, when I watched Cabin in the Woods, I immediately started to wonder: how can there be a sequel to this movie? Of course, I can't even explore why that's a difficult question without spoiling the film, and I won't do that in this posting. However, what I can say is that a sequel would have to be a very different story, and might not interest the same audience. A prequel could be interesting, but it might be slightly predictable, since we're told at a certain point in the film, pretty much exactly what has transpired before.
This is where I lit on the idea of the "altquel". That is, a sequel that follows the same events from the first film (perhaps from a slightly different perspective) up to a critical moment in the film, where a key even causes the two films to diverge. Essentially, it's the story of an alternate timeline or universe in which the same events lead up to very different results.
So why an altquel for Cabin in the Woods, specifically? Without indulging in spoilers, all I can say is that there is a moment in the film where we get a glimpse of what might have happened, had any one of several other actions been taken. It's a perfect jumping-off point for an altquel!
But, Cabin in the Woods is really more than just a horror movie. It's a postmodern, revisionist take on the state of the horror movie genre, so why go with a straight altquel? Why not tell all of the stories at once? How? OK, that will require spoilers, so let me give you some time to go watch the movie, first...