A 1980 X-Men story by Chris Claremont and John Byrne, taking place from Uncanny X-Men #129 to #137, and one of Marvel Comics' most iconic storylines. Fresh off a battle with Proteus, the X-Men are plunged into a battle with the mysterious Hellfire Club, while Phoenix, just back from a vacation in Greece and Scotland, finds herself psychically shifting in time to a Revolutionary War-era ancestor, who's engaged to a mysterious, roguishly handsome man named Jason Wyngarde.