Sources for letters credit are The Official Marvel Index to the X-Men (Olshevsky 1987), The Official Marvel Index to the X-Men (Ward 1994), and Official Index to the Marvel Universe (Vandal et al. 2009).
Jack Kirby (p. 1 & layouts, pp. 2–20); Werner Roth [as Jay Gavin] (pp. 2–20)
The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Magneto; Mr. Worthington; Mrs. Worthington
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.
in Fantastic! (IPC, 1967 series) #32 (23 September 1967) [Black and white. The first part of this story is reprinted, pages 1 to 10. ], #32 (23 September 1967), #33 (30 September 1967) [Black and white. Second half of story, pages 11 to 20. 'New' recap page at the beginning of this story.]