The Mighty Thor #391 is a single issue comic book published by Marvel Comics in May 1988 during the Copper Age. It features the first appearance of Eric Masterson and includes Spider-Man as a character. The cover artists are Ron Frenz and Brett Breeding, with writing by Ron Frenz, Brett Breeding, Christie Scheele, and Tom DeFalco. The story revolves around Thor, Hogun, Volstagg, Grand Vizier, Spider-Man, and other characters within the tradition of US Comics, making it a valuable collectible for fans of superhero comics.


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