X-Men Vol.1 #70
In the aftermath of their battle with the Sentinels, Hank, Bobby and Scott are taken to the hospital with injuries; Iceman is delirious in a coma but his companions recover quickly; When Warren's parents call and say they are dropping by for a visit, Angel flies back to the mansion where he is attacked by a mysterious stranger; Xavier and Cyclops, worried with no word from Angel, also return home and are attacked; Beast and Jean are the last to show up and are also taken down; As Warren's parents arrive at the mansion, they are greeted by Magneto.
First Printing: Jul 1971
Writers: Stan Lee
Art: Jack Kirby, Werner Roth, and Dick Ayers
Cover: Jack Kirby