The Seattle Core is a fictional location found in Marvel Comics Age of Apocalypse storyline.
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Madelyne mysteriously reappeared many years later as an amnesiac to Nate Grey (X-Man) — the "genetic son" of Scott Summers and Jean Grey from the alternate reality known as the Age of Apocalypse — when he came to Earth-616.
Using his Amahl Farouk body again, Shadow King appeared as a member of Daken's Brotherhood of Mutants (consisting of Sabretooth, Mystique, Skinless Man, the Blob from Earth-295, and the Omega Clan) in a plot to attack the members of X-Force.
With the end of the Age of Apocalypse, the Dark Beast was able to escape into Earth-616 through the M'Kraan Crystal.
He was one of a handful of characters to escape the Age of Apocalypse reality to the regular Marvel Universe, where he has continued his unethical experiments.
Although many Age of Apocalypse characters were alternate versions of existing heroes and villains, Damask did not appear to have an Earth-616 counterpart until Miss Steed was introduced over a year later.
Although many Age of Apocalypse characters were alternate versions of existing heroes and villains, Sugar Man does not appear to have an Earth-616 counterpart.