Why not? they are giant creatures that destroy cities in their own movies. seems like a no brainer to have them in the same one together (and they were in the 1962 movie)
It's like Spider Man and Superman in a boxing ring.
Or better yet Captain Kirk vs Darth Vader.
well in the first kong vs godzilla movie Toho (the japanese company behind the godzilla movies) actually gave King Kong more powers such as the ability to absorb electricity and even firing it back.
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