Fantastic Four (comic book) for the Canadian reprints. British publication of the series began in the black and white anthology title "Mystic" in the 1960s. In 1972, the Fantastic Four's adventures were published starting with issue 1 of the US comic in "Mighty World of Marvel" alongside Spider-Man and Hulk reprints when Marvel Comics began its imprint Marvel UK. In 1976 the feature was moved to Marvel UK's "The Titans" to revive flagging sales, starting with issue #27. But after just a few months the feature was removed from "The Titans" (replaced by The Avengers) to form part of the line up of the
X-Men: Legacy the parent title "Uncanny X-Men", with co-writers Chris Claremont and Jim Lee, previously the penciler on "Uncanny", moving over to "X-Men", while studio mate Whilce Portacio took over penciling duties on "Uncanny". "X-Men" #1 is still the bestselling comic book of all time, with pre-order sales of over 8.1 million copies, according to Guinness Book of World Records, which presented honors to Claremont at the 2010 San Diego Comic-Con It is estimated that somewhere between 3–4 million copies were actually sold. The sales figures were generated in part by publishing the issue with five different variant covers, four of which