Pencils credit is disputed. Larry Lieber per Steve Whitaker and Nick Caputo. Ed Hannigan is credited in 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), although Nick Caputo believes the time frame is off and Hannigan was not yet working at Marvel. But Hannigan, interviewed in 1984 by Archibald Haddock, said that he first arrived at Marvel in 1971 or 1972 (Amazing Heroes 45, p. 36). Hannigan recalled working regularly on Marvel's weekly British reprint comics under Tony Isabella (pp. 36–38), who separately recalled working on the weeklies from late 1972 till 1974 (tonyisabella.blogspot.com/2012/09/countdown-to-9-21-12-garage-sale_10.html). Hannigan started doing covers while working on the British weeklies (p. 38). The original indexer credited Marie Severin.
Sources for letters credit are The Official Marvel Index to the X-Men (1994) and Official Index to the Marvel Universe; The Marvel Comics Index (Olshevsky 1981) and The Official Marvel Index to the X-Men (1987) attributed letters to Gaspar Saladino.
Set in 2061. Story is inaccurately credited as originally appearing in Amazing Adventures #11.