Hey guys. Someone made a fan comic uniting both Ben 10 and Danny Phantom, set five years post the end of both series. I've read it and it is really good, the writer has a very in-depth understanding of both universes. I'd recommend you check it out even if you don't like/never watched Danny Phantom. The guy who made it is trying to get as much traction as he can behind this, so show your support if you enjoy it.