Thor #391 (May 1988) 7.5 VF-

Thor #391, published in May 1988, is a Copper Age Marvel comic featuring Thor, written by Tom DeFalco with cover art by Ron Frenz.

Entitled The Madness of Mongoose, this story stars Thor — The Odinson — as he battles powerful villains, mythological creatures, cosmic threats, and enemies from across the Marvel Universe.

It is regarded as a key Thor comic due to the following significant event: 1st appearance of Eric Masterson (later Thunderstrike).

Featured appearances include Thor, Mongoose, Spider-Man (Peter Parker), and other characters from the Thor series.

A Copper Age Thor comic, this issue showcases evolving Marvel storytelling, deeper character development, epic mythology, and fan-favourite adventures featuring the Mighty Thor.

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