Honestly, I have no idea how the hell I'd pull that one off since the worlds are so incompatible. But still, I keep making jokes about Amaterasu being Nippon's dumber equivalent of the Doctor, including companions, one fruity captain (although the Tao Troopers are even more useless than Torchwood TBH), and a "clap if you believe!!!" arc finale. Plus, alien-origined monsters, and even a couple of WTF time travels.