All characters are in their prime.
Batman gets exactly one month of prep time for all four of them and can bring any gadget/tool he can fit in his fanny pa- err I mean utility belt...
Vader gets just what you'd expect him to have.
Chief is armed with a BR, two Halo 3 magnums (hue) two frags, one plasma and one energy sword.
Supes is well, Supes.
and Dora has her Backpack, backpack. Backpack, backpack...
Who wins? Personally, I think Dora would solo.
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Wow really? Superman obviously.