The Amazing Spider-Man #20

Cover A

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Key factsKey issue

1st appearance of Mac Gargan
Origin of Mac Gargan
Origin of Scorpion

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Market value

Market value (all grades)

Low: $425
Mid: $650
High: $1,403

Updated 12 Oct 2026

Graded copies for sale: $110 - $2,300; 20 graded copies for sale, Updated 10 Oct 2026

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Reprinted 26x

J. Jonah Jameson pays Dr. Stillwell to turn Mac Gargan into the Scorpion to try to capture Spider-Man. Stillwell's formula makes Gargan become more evil than he originally was and the Scorpion goes on a rampage and is finally stopped by Spider-Man.

Cover date

January 1, 1965

On sale date

October 8, 1964

Pages

Cover price

$0.12

Rating

Approved by the Comics Code Authority

Editor

S.L

Price history

Starter

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Credits

Writer

S.L, Stan Lee

Penciller

Jack Kirby, John Romita Jr, Steve Ditko

Inker

Paco Díaz, Sol Brodsky, Steve Ditko, Stone

Colorist

Erick Arciniega, STAN GOLDBERG

Letterer

Sam Rosen

Cover Artist

Steve Ditko

Characters

Mac Gargan (1st appearance); Scorpion (1st appearance); Peter Parker; Spider-Man; Aunt May Parker; Betty Brant; Dr. Farley Stillwell (death); Flash Thompson; J. Jonah Jameson; Ned Leeds; Liz Allan

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