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who wins? fight takes place at the xavier institute.

Colossus beats him by incapacitation ripping into him.

Man-Thing can regrow himself under his own power, ie, doesn't really even need nearby vegitation/swamp to regenerate. Colossus has no way of actually putting him down (Hulk can't do it).

On the flipside, Man-Thing probably couldn't do to much to Colossus, unless Colossus felt fear, man-thing's burning touch has done serious damage to some tough people.

The fight probably goes like this:

http://img140.imageshack.us/img140/2415/incrediblehulk42814.th.jpg

Its a draw any time it doesn't frighten Colossus, a win for Manny any time it does.

I gotta bump this

for all the respect Colossus gets on these forums, nobody is going to say he can beat a swamp monster?

EDIT: the thread directly under this has colossus against ultimate thor.