Sideways.

What if the superheroes from the comic books decided to change villains?  I know this has probably been written about before but I don't read fanboy crap so deal with it.

Batman and Superman.  Picture this:  The Riddler or the Joker is going to do whatever terrible thing they are going to do and Supes uses his hearing and vision to find the villains, swoops in and grabs them before major bad things happened.  You say that Bats isn't tough enough to deal with Supes villains?  True, but Supes has something that Bats doesn't, remorse.  Oddly enough, whenever I think of Batman I always think of the old school psychopath that would kill yet when I think of Catwoman I think of Julie Newmar.  Lex Luthor is causing problems?  Not when his spine is broken right before Batman shoots him.  Even the more powerful villains that Supes dealt with don't hold a candle to the ruthlessness and deviousness of Batman.  Batman is probably the only person in their universe that wanders around with a piece of kryptonite encased in lead in his utility belt, just in case Supes goes rogue and must be put down.

The Fantastic Four and the Avengers.  The FF deal with Ultron by encasing him in a force bubble while Mr. Fantastic makes a slingshot and the Thing uses him to sling him into space.  Torch uses some generic starship (I bet money they had one, I never really cared for the Four) to use a tractor beam to keep Ultron moving towards the sun or a convenient black hole.  The Avengers get to play with Dr. Doom, I don't think that Victor Von Doom can handle Iron Man, Thor, Hulk, Captain America plus whoever else is hanging around at the time.  Doom is tough and smart, I give him that, but Iron Man, Thor, and the Hulk pack a whole crap load of power.  Even Galactus might have problems with that, or Iron Man could download Windows Vista into his operating system, he would so crash.