a book by Alan Grant
In this oversized book, the first-ever major crossover between Marvel and DC, comic fans finally got to see the companies' top two heroes in the same story. Billed as "the battle of the century," the story saw Superman and Spider-Man apprehending their respective archenemies, Lex Luthor and Doctor Octopus. The two criminal geniuses promptly escape from jail to plot a new evil plan. After the requisite misunderstanding and fistfight between Superman and Spider-Man (whose strength was temporarily boosted to Superman's level by Luthor), the two heroes join forces to foil the villains' scheme, save their girlfriends, and avert a planetary disaster caused by Luthor's latest evil device.
All in all, it was a fairly standard outing for both heroes, with scripts and art by Gerry Conway, Ross Andru, and Dick Giordano. The story was plainly outside the "official" history of either hero; in the story, both the heroes and villains acted as if they had always lived in the same universe.