The Spectacular Spider-Man #12

Spider-Man finds himself caught between two formidable foes in this November 1977 issue — the dark-clad Brother Power and the white-robed Sister Sun, who together unleash crackling energy blasts against our wall-crawler in what looks like a park setting, while a fallen figure (Flash Thompson, per the cover's own question) lies unconscious at Spidey's feet. The cover, penciled by Al Milgrom and inked by Terry Austin, radiates that vivid Marvel energy, with purple-costumed cultists lurking in the background adding an unsettling sense of scale to the threat. With the cover itself asking whether Spidey and Flash Thompson will survive the encounter, this is a genuinely intriguing chapter from the Peter Parker, The Spectacular Spider-Man run.