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A key issue is a comic that marks a first appearance, origin or other documented milestone

By the PopJunk Serials desk. Updated Nov 1, 2026

A key issue is a comic that carries a documented milestone in the history of a character, creator or series, such as a character's first appearance or origin. The table behind this page holds 25 first-appearance rows. Each one gives the issue exactly as a publisher or library states it, links the page that says so and shows the day that page was read. No row carries a price.

A publisher's profile names the first appearance

DC's character profiles each name one first appearance. The rows below are taken from those profiles word for word, so the cover date is a year, which is all DC gives.

Read the issue column as the publisher's claim about a name. It is the first thing to check a listing against.

An origin issue can be the debut itself

The Library of Congress holds the 24 original drawings by Steve Ditko for Amazing Fantasy No. 15. Its Treasures Gallery post says Spider-Man makes his debut in that issue, names the Spider-Man origin story among the drawings and describes the August 1962 issue's story as eleven pages. Here the origin and the first appearance are the same comic, and the source is a library rather than a publisher or a retailer.

That is the clean case. A character's origin can also be told after their debut, in which case the origin issue and the first appearance are two different keys. The table here lists only the debut rows, because those are the rows with a source that was opened.

Two characters can share one key issue

Where a publisher gives the same issue for two names, the issue is the key for both. The computed list below shows every issue in the data that DC names for more than one character.

Flash Comics #1 is the first appearance DC gives for both Hawkman and The Flash. Batman #1 is the first appearance DC gives for both the Joker and Catwoman, More Fun Comics #73 for Aquaman and Green Arrow, and DC Comics Presents #26 for Cyborg and Raven. A collector looking for either character lands on the same comic, so one copy answers two searches.

One name can point to several issues or several people

Detective Comics appears three times in the data, for three characters, at three different issue numbers.

A title name alone does not identify a key. The issue number does, and so does the character the number is attached to. Robin shows a second problem: DC's profile lists four people who used the name (Dick Grayson, Jason Todd, Tim Drake and Damian Wayne) and gives one first appearance for the name. The Flash profile lists Barry Allen, Jay Garrick and Wally West under one first appearance. The Green Lantern profile names Hal Jordan and gives All-American Comics #16 (1940) for the name, so a listing that says "first Green Lantern" needs a check on which Green Lantern the issue introduces.

Sources can disagree by one issue

DC's profile gives Nightwing's first appearance as Tales of the Teen Titans #43 (1984). Wikipedia's Nightwing article says Dick Grayson first adopts the Nightwing identity in Tales of the Teen Titans #44 (1984). The two sources are one issue apart on the same name change. The same Wikipedia article's infobox goes back further still and lists Superman #158 (January 1963) as the first appearance of the Nightwing name, two decades before Grayson took it. This page does not settle which is right, and the data file carries a note on the Nightwing row so the lookup shows it.

A seller who writes "first Nightwing" may mean any of three comics, twenty-one years apart. The issue number on the listing says which one is in the bag, so read it before the price.

Deaths, first issues and last issues are milestones this table does not cover

Collectors also describe a death, the first issue of a series or the final issue of a run as a key. They are absent here because the rows in this data come from pages that state a first appearance, and a death or a final issue needs its own opened source for each comic.

The lookup finds a key by character, title or issue

The key issue lookup searches the same 25 rows by character, title, issue number, cover date or publisher. A worked search: type "Detective Comics" and it returns 3 rows, the three above. Type "Robin" and it returns the Detective Comics #38 row with DC's note that four people used the name. Each result shows the source link and the read date.

Four checks turn a claimed key into a checked one

1. Find the page that states the milestone, and prefer the publisher, a library or a database over a retailer's description.
2. Match the issue number to the character, not just the title.
3. Note whether the source covers a name or a single holder of it.
4. Look for a second source, and if they differ, record both numbers before buying on either.

Sources

• DC Comics, character profiles, each opened and read 1 November 2026: Superman, Batman, Wonder Woman, Supergirl, Martian Manhunter, Swamp Thing, Bane, Robin, Nightwing, Hawkman, The Flash, Joker, Catwoman, Green Lantern, Aquaman, Green Arrow, Cyborg and Raven.
• Library of Congress, Treasures Gallery: Spider-Man's Origin Story, posted 5 June 2024, read 1 November 2026.
• Wikipedia, Nightwing, read 1 November 2026. Used only for the competing #44 and the Superman #158 entry in its infobox.
• CGC, Grading scales, read 1 November 2026. Source of the 9.8 definition and the 10-point scale.