It is well know that Batman has a contingency plan for everything. This includes plans to neutralize the Justice League. However, if Batman was a Marvel property, how would he go about taking down Earth's Mightiest Heroes?
#1 Steve Rogers as Captain America
Steve Rogers is the model American citizen. He is loyal, courageous, hard-working, and filled with passion to serve his country. He essentially has an unbelievably strong will. What if I were to break this will? Using high grade hallucinogens and hyper-suggestibility techniques, I could potentially break this will, leaving Rogers a mental wreck.
#2 Batman's Log: File 7/4-1776 Codename...Fireworks
Tony Stark is Stark Tech. It is housed in his very body. Using several high-powered magnets on Stark while he is armor-less will make him extremely vulnerable. A few good blows to the head should do him in.
#3 Batman's Log: File 420 Codename...Ipod
Thor is essentially a god. Strong, fast, inhuman, its like hes some kind of superman. Apparently, if Thor is no longer worthy, he will not be able to lift his Hammer, stripping him of his powers. I have already begun training my mind and body to become "worthy", hopefully this will give me the edge I need over "mortal" Thor. If not, a vile of knockout gas should do the trick.
#4 Batman's Log: File 7-15-4 Codename: ACDC
Hulk is an unstoppable brute. At least he was, now he is controlled by the nuclear physicist Dr. Bruce Banner. In order to stop a rampaging Hulk, I'd recommend enlisting a telepath such as Jean Gray to manipulate his mind. If Hulk thinks he has taken innocent lives, or those of his friends, he may revert back to normal. If this does not stop him however, a satellite laser strike could be utilized. If all options fail, the Batbot could buy enough time to evacuate the area until hulk calms down and can be contained.
#5 and #6: Batman's Log: File G-2-15-13-2 Codename- SMASH!
Batman's Log: File 69-b Codename...Black Hawk Down
These two are master assassins. They are also lovers, and would be devastated if one were to be injured or killed. I f I could split them up, defeating each individually would be quick and easy, as my skill-set far outclasses them.
Batman's Log: File Alpha 616 Codename...Shawarma
The avengers are a powerful and enormous team. The chances of all of them turning are unlikely and nearly impossible. I hope these plans will never have to be used, but just in case, I am giving them to you.