The Marvel Cinematic Universe wears its Ultimate Marvel influence on its sleeve, but their most important character Iron Man has very little to do with his Ultimate counterpart — by design. Written by famous science fiction writer Orson Scott Card, the series was not as well-received as the other hero revamps in the Ultimate line and was quietly buried and eventually forgotten. Of note is Tony's unique physiology — he's barely even human — and he lives with a secret that was simply too strange for the MCU to adapt.
The MCU owes quite a lot to the Ultimate Universe in terms of visual design. Captain America from the 2011 film Captain America: The First Avenger has a battle-ready suit during his days in World War II with plenty of straps, pouches for equipment and ammunition, and a helmet in place of a cloth cowl he wore in the Silver Age of comics. Hawkeye's more simplistic suit is a far cry from his circus-inspired attire in the prime universe as well. But Iron Man lacks his Ultimate-inspired outfit almost completely (the silver accents and alien-esque helmet are absent), and Ultimate Iron Man is to blame.
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In Ultimate Iron Man, tech billionaire Howard Stark creates a spray-on blue bio-armor that prevents most injuries, but eats away at the wearer's skin over time. Meanwhile, Stark's lover Maria Cerrera is working on a virus that regrows limbs and tissue — but Cerrera is accidentally infected with the virus along with her unborn child. Cerrera dies in childbirth, and the infant Tony has been infected with the virus; his skin is hyper-sensitive to the air and he feels tremendous pain. Howard sprays him with the blue body armor, and Tony ceases crying.
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