... rather than the good guys winning and so forth, the Doctor had his companions had actually lost. They'd just gotten out of the processing factory with their lives, and the Doctor's all "well, we bollocksed that one up. Time to leg it!" amd Mickey's all "Hey, you might not want to stick around and clean up the mess you've made, but I'm sure as hell going to." Then after the TARDIS leaves the world is overrun by Cybermen, because it's an alternate reality, and you can do that. And Mickey's leading the underground resistance, etc.
Or maybe that is just me.