Cover pencils by Jack Kirby (layouts) and Werner Roth, inks by Dick Ayers. Lo! Now Shall Appear--The Mimic!, script by Stan Lee, pencils by Werner Roth (as Jay Gavin), inks by Dick Ayers; The X-Men are off to take a vacation when Bobby and Hank tussle with the mysterious Calvin Rankin who beats them by mimicking their powers; Calvin then has an encounter with Jean at a restaurant; Realizing he is dealing with the X-Men, Calvin follows Jean home and asks to join the X-Men; once he has absorbed all of their powers, however, he battles them and captures Jean; The team follows him to his secret hideout deep in an old mine where Mimic uses their combined powers to uncover a machine his father built that will allow him to keep the X-Men's combined powers for good; Realizing something at the last minute, Xavier allows Mimic to use the machine which doesn't give him powers but, rather, strips his mimic powers away; 1st appearance of the Mimic