Len Wein (June 12, 1948 – September 10, 2017) was an American writer. He was perhaps best known for co-creating Swamp Thing for DC Comics, and for writing Giant-Size X-Men #1 for Marvel Comics — in which he co-created some of the X-Men's most popular characters, including Storm, Colossus, Nightcrawler, and Wolverine.
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