Batman / Blue Falcon
5 Crossovers That Needs To Happen
Justice League / Transformers
The Dark Knight meets The Time Lord. It's an old crossover but it's one the fans would eat up. I feel The Doctor's intellect would be too superior for Batman so you would probably see him display more physical skills and gadgets. Hell, maybe we could see The Doctor wearing Batman's utility belt. For now this fan pic above is the closest we'll get to Batman and The Doctor teaming up.
The ultimate crossover and the only one that really needs to happen. Fans can finally get that official origin that Matt Murdock was the kid who dropped his pet turtles in the sewer during the mutagen car accident. Get Frank Miller to write this crossover plus have him and Kevin Eastman do a variant cover.
Punisher VS Predator