Marvel Comics' Death of Doctor Strange event has proved the MCU made a big mistake with its Sorcerer Supreme. In the comics, the line of Sorcerers Supreme began some 1,000,000 years ago, when the mystical Agamotto first claimed the title. Recognizing Earth's vulnerability to demonic and extradimensional threats, he established spells that ensured there would always be a Sorcerer Supreme — a champion who would protect the dimensional plane from the creatures that sought to conquer or devour it.
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