in Super Spider-Man (Marvel UK, 1976 series) #235 (10 August 1977) [pages 1-9, black and white], #236 (17 August 1977) [pages. 10-14, 16, 17, black and white, original title "Stegron Stalks the City"]
Letters of comment from readers Jim Hoskins, Walter Alcutt, Jack Steinmann, and Larry Lisowski. Also, including information about the origin of Nightcrawler in X-Men.