Choose wisely.
Batman.
He has defeated the rest.
You know you will be dressed in all yellow from head to toe in an all yellow room.
You know that there will be high amounts of kryptonite in the room and it will be encased in lead.
You also can know that there will be huge tuning forks so that if they pick up the very slightest of vibrations, it will pop Flashes head like a zit.
Not only that all friction would be removed from the room.
Wolverine is kind of outgunned here, Magnets...how do they work. Then throw the little bastard in a furnace, then sent a limb to each of the four corners and bury it at sea.
The head throw into a volcano.
He can come back? Ok.
Spider Man would not do it.
Even if he caught you eating a bloody box of Uncle Bens wearing Aunt Mays panties.
Iron Man has an ego, but he is also slave to his electronics.
Wonder Woman you may have to invoke some old right of combat bullshit, or old law or god shit.
Robin just smack around if needed, but he is more likely to help you...unless it is Damien.