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The individual books collectors chase, why they matter and what to check before buying.
Key issues
New Mutants #98 (February 1991) is the first appearance of Deadpool, Gideon and Domino (Copycat), by Fabian Nicieza and Rob Liefeld, two issues before the title became X-Force. It is the most valuable comic of the 1990s. Supply is large, so the market is concentrated at 9.8; newsstand copies, which are much scarcer, and the second printing carry premiums, and several reprints and facsimiles exist.
Updated Oct 11, 2026
Key issues
Superman #2, cover-dated Fall 1939, is the second issue of the first comic devoted to a single superhero, with Joe Shuster's cover of Superman lifting a car. Like Superman #1 it reprinted and expanded early Action Comics stories alongside new material. It is a Golden Age key in its own right — far more affordable than #1, but scarce in any grade and one of the earliest Superman solo issues a collector can realistically own.
Updated Oct 11, 2026
Key issues
Sub-Mariner #1 (May 1968), by Roy Thomas and John Buscema, launched Namor's first solo title of the Silver Age after his feature in Tales to Astonish ended. It is one of the 1968 Marvel expansion #1s — with Captain America #100, Iron Man #1, Silver Surfer #1 and Nick Fury #1 — and a solid Silver Age key with a Buscema origin retelling. Namor himself dates from Marvel Comics #1 (1939) by Bill Everett.
Updated Oct 11, 2026