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What is Marvel Comics' Legion Quest?
Legion Quest is a six-part Marvel Comics crossover event involving the X-Men, published in 1994-1995. It was a prelude to the Age of Apocalypse extended storyline.
What is Marvel Comics' Age of Apocalypse?
Age of Apocalypse is a 1995 comic book crossover storyline published in the X-Men franchise of books by Marvel Comics.

Question: Who was Magneto?
Self-contained rewrite: Who is Magneto?