Cap/Indy crossed my mind seconds after I wrote that.
Transformers/Doctor Who/Fanatastic Four. Crazy!!!!
Upon giving it some more thought DC crossed their Universe with licensed products on occasion. I recall an issue of DC Comics Presents featuring Superman and the Masters of the Universe. I think their Captain Action comic took place on Earth-1. Then you have Jerry Lewis and Bob Hope who operated on the comic fringe of the DCU. Thats something you don't see these days. No Adventures of Will Ferrell comics.