Scarlet Witch, as seen in Doctor Strange's film, can depower powerful Marvel contenders. Her ability to absorb powers and exploit Superman's weakness to magic makes her a formidable threat. Controlling the fight's early stages will be crucial for her success.
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Thanos, a formidable foe akin to Darkseid, is a genius tactician. With an infinity stone, he overpowers Superman. Only All-Star Superman, lifting 200 quintillion tons, stands a chance, but his moral code limits him. Thanos prevails.
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Captain Marvel, despite shared psychological weaknesses, matches Superman in skill, strength, and endurance. Only energy absorption can defeat him. As a cosmic-level hero, she has faced tougher challenges. If she can depower him, it's game over for Superman.
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In JLA/Avengers #2, Thor and Superman clashed, with the latter eventually lifting Mjolnir. However, Thor revealed it was allowed by Odin. Despite the defeat, Superman acknowledges Thor as his strongest opponent. A rematch would likely have a different outcome.
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Iron Man's genius would be futile against Superman's speed, but with knowledge of Kryptonite and Red Sun powers, he could create a suit to weaken the Man of Steel. Deprived of his powers, Superman would be defenceless against Iron Man.
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Doctor Strange, a tactical mastermind and the strongest magic user, exploits Superman's vulnerability to magic. With the Time Stone, he can analyze timelines where Superman loses and craft a lethal scenario to defeat him.
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Galactus, ancient and wielding the Power Cosmic, can shift planets and overpower Superman effortlessly. Only if weakened by hunger does Superman stand a chance. Galactus' unmatched power makes Superman seem insignificant in comparison.
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