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X-Men: 1x3

Enter Magneto

As the Beast faces an arraignment in court before a mutant-hating public, the X-Men unwillingly take in an old enemy of Wolverine’s. Magneto, an old friend turned enemy of Professor Xavier’s, attacks a military base in an attempt to unite mutants against humanity.

X-Men: Season 1 Episode 3
Nov. 27, 1992