Now that's what I call dowloadable content.
It's certainly not the only new DLC - there are new maps, new weapons, new aliens and the like. But it is a bugnuts crazy crossover that you wouldn't think would just be casually tossed into a new DLC. Nothing says "realistic military game" like a druid-powered bogeyman who can't be killed (sorry, the druid thing is part of canon. You can take that, or you can take the Rob Zombie version. Yeah, thought so.)
They should make it so you can play as Mike Myers - even the new radioactive explosive you can use isn't as a big a bomb as The Love Guru. On second thought, they should just make it so you can fight Mike Myers. Maybe Rob Zombie too, while we're at it. I'd never get bored of that game.