# Uncanny X-Men (1963) #12

Published: 1965-07-01T00:00:00+0000
Series: Uncanny X-Men (1963 - 2011)
Creators: Stan Lee (writer), Jack Kirby (penciler), Vince Colletta (cover artist), Alex Toth (penciler), Sam Rosen (letterer), Art Simek (letterer)

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It's always awkward to have relatives crash at your place, especially when they're knocking down the walls! First appearance and origin of Professor X's stepbrother, the Juggernaut!