It's always darkest before the dawn - Steve Englehart

Continuing the saga of Marvel's original mutant team, we bring you the most unusual X-Men adventures ever! Pushed undercover by anti-mutant paranoia, Hank McCoy sets off on his own, taking a research job. But his scientific curiosity will curse him forever when an experiment gone wrong turns him into a fanged, furry, blue Beast. Meanwhile, the other X-Men find themselves pursued by a secret adversary that seeks to pick them off one by one. They must join forces with Captain America to save the nation and rescue their mutant comrades. Also featuring the first appearances of Wolverine, the top-secret Weapon X program and Madrox the Multiple Man, an X-Men/Avengers battle against Magneto, and a host of x-tra rare X-Men covers! Collecting: vol. 4; X-Men (1963) 67-93, Annual (1970) 1-2; Amazing Adventures (1970) 11-17; Amazing Spider-Man (1963) 92; Incredible Hulk (1968) 150, 161, 172, 180-182; Marvel Team-Up (1972) 4, 23; Avengers (1963) 110-111; Captain America (1968) 172-175; Defenders (1972) 15-16; Giant-Size Fantastic Four (1974) 4