Writerly over at the Moviestorm forums is on a roll lately. I don't know if it's insane ambition and talent or one too many cups of coffee, but he's been releasing new mods for the program almost daily, and these are some excellent mods!
The latest is the Alien from the "Alien" movie franchise. The troublesome terror is rigged to the male puppet rig, which means you can use all the male animations with it (though some just don't look right because of the shape and size of the alien relative to his meal). It looks particularly impressive if you use it with the vampire jumping animation from the "Dark Romance" addon from Moviestorm and some of the action animations found on Moddingstorm.
You can download it here.