Seriously, It'd be awesome if the DC Universe had
any major crossover with Ben 10 whatsoever, and it's totally feasible since both franchises are under the Warner Brothers umbrella, as far as my knowledge goes. It honestly makes too much sense, as Ben 10's original continuity (the first 4 shows) has into action scenes, scenerios, and character designs that all borrow
heavily from the general aesthetic of American comic books. It's sad that the only time I've seen these universes have any overlap was in that 11-min OK KO crossover episode (which was great, btw), and in this
CN Promo.