Published Oct 1968 by Marvel.
First appearance of Lorna Dane (Polaris). Cover art by Jim Steranko. Who Dares Defy the Demi-Men?, script by Arnold Drake, pencils by Don Heck and Werner Roth, inks by John Tartaglione; Angel warns Jean about Cerebro beeping loudly, and she tells the other X-Men; a group commanded by Mesmero uses a machine (along with his powers) to turn latent mutants into full-fledged mutants in order to form his army; 1st appearance of Mesmero. A Beast Is Born--The Origins of the Uncanny X-Men, script by Arnold Drake, art by Werner Roth; how Beast got his powers. Letter to the editor from comic writer Tony Isabella.