yes the peter parker Spider-Man is in the ultimate comics but a
new Spider-Man named Miles Morales has taken up the role as
Spider-Man in the ultimate comics
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In the Ultimate comics, Spider-Man typically weighs around 167 pounds, as stated in the comics.
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No DC comics does not own iron man as marvel comics is the
rightful owner.
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If you are referring to the Marvel Comics Iron-Man, then no.