The foundational Thanos key is Iron Man #55 (February 1973), the first appearance of the Mad Titan created by Jim Starlin: our eBay estimator returns a median of €9 across 73 listings (all grades and printings combined). In high grade, a CGC 9.8 copy sold for $13,025 on ComicLink in 2013 — the documented benchmark for that grade.

Thanos is a Bronze Age creation: there are no Silver Age or Golden Age issues featuring him. Jim Starlin conceived the character in 1973 and immediately embedded him in a cosmology blending philosophy, mysticism, and science fiction. From his very first pages, Thanos transcended the role of simple antagonist to become one of Marvel's most complex figures — obsessed with Death, with absolute power, and with his own destruction. That narrative coherence, sustained over fifty years and three generations of readers, explains the durability of his collector market.

This guide sticks to the verifiable: eBay medians from our estimator (eBay.fr + eBay.com, June 2026) and records documented by Heritage Auctions, ComicLink, and specialist press. Our estimator covers Iron Man, Silver Surfer, and Avengers; the Captain Marvel, Warlock, and The Infinity Gauntlet series are not indexed — figures cited for those titles come exclusively from documented third-party web sources. A key methodological note: the eBay median blends all grades and all printings — it reflects the entry-level market, not high-grade CGC copies.

Thanos key issue ranking (real data, June 2026)

The table below covers the most significant issues by collector importance and eBay availability. Series absent from our estimator are flagged; their values come from documented third-party sources.

IssueSignificanceeBay data (all grades)Documented record
Iron Man #55 (Feb. 1973)1st appearance of Thanos and Drax the DestroyerMedian €9 · 73 listings$13,025 (CGC 9.8, ComicLink 2013)
Captain Marvel #25–33 (1973–74)The Thanos War — Starlin's foundational sagaSeries not indexedWeb sources only
Avengers #125 (Jul. 1974)Thanos War conclusion, key crossover chapterMedian €9 · 54 listingsNot publicly documented
Warlock #9–15 (1975–76)Soul Gem saga — Thanos as ally, then nemesisSeries not indexedWeb sources only
Silver Surfer #34 (Oct. 1990)Thanos returns after 13 years — modern revivalMedian €19 · 55 listingsNot publicly documented
The Infinity Gauntlet #1–6 (1991)Starlin/Pérez/Lim masterwork — the SnapSeries not indexedWeb sources only
Thanos vol.2 #13 (Nov. 2017)1st appearance of Cosmic Ghost Rider (Cates/Shaw)Series not indexedWeb sources only

Record sources: ComicLink, Bleeding Cool, GoCollect, sellmycomicbooks.com. eBay medians: mycomicscollection.com estimator, June 2026.

Iron Man #55 (1973): the Mad Titan's debut

Published in February 1973, Iron Man #55 is the ground zero issue for any Thanos collection. Jim Starlin — plotter, penciler, and colorist — introduces both Thanos and Drax the Destroyer in the same issue, two characters who would anchor Marvel's cosmic line for half a century. The concept is entirely Starlin's; Mike Friedrich co-scripted dialogue, but the intellectual and visual architecture is Starlin's alone. Thanos arrives fully formed: intergalactic conqueror, son of Mentor, and already in thrall to the cosmic force he calls Death.

Our eBay estimator returns a median of €9 across 73 listings — among the highest listing volumes in our database. That low median is expected: it aggregates all printings (including modern reprints) and all conditions, from heavily damaged to merely decent. It represents the entry-level market, not the value of a period copy in solid shape. In high grade, the documented benchmark is $13,025 for a CGC 9.8 (double cover, white pages) sold on ComicLink in 2013. The issue regularly appears on Overstreet's list of the top 25 Bronze Age keys.

The Starlin saga (1973–1977): Captain Marvel, Warlock, and Thanos's first death

Between 1973 and 1977, Jim Starlin built one of the most ambitious cosmic epics in Marvel history around Thanos. It unfolds in two main acts. The first — the Thanos War — runs through Captain Marvel #25 to #33 (March 1973 to January 1974, bi-monthly): Starlin rescues a struggling title and transforms it into a spiritual and martial odyssey, with Mar-Vell confronting Thanos as he attempts to seize the Cosmic Cube and become a god. The arc concludes in Avengers #125 (July 1974), for which our estimator returns a median of €9 across 54 listings.

The second act opens in Warlock #9 (October 1975): Starlin reintroduces Thanos as a temporary ally of Adam Warlock against the Magus, before revealing him as the ultimate threat seeking to assemble all six Soul Gems. The saga runs through Warlock #15 and concludes in Marvel Two-in-One Annual #2 (1977) — the issue in which Thanos is killed for the first time, petrified by Adam Warlock himself. These series are not indexed in our estimator; values vary considerably by condition and CGC grade.

Silver Surfer #34 (1990) and The Infinity Gauntlet (1991): the great resurrection

After thirteen years of absence, Thanos returns in Silver Surfer #34 (October 1990), resurrected by Death herself to rebalance a universe grown too crowded with life — a task he immediately subverts in favour of a far greater ambition. Our eBay estimator returns a median of €19 across 55 listings for this issue: a reliable signal, with sufficient volume and the highest median of all Thanos issues tested. It is also the most accessible entry point into the modern saga.

The culmination came in 1991 with The Infinity Gauntlet #1–6, Starlin's landmark mini-series drawn by George Pérez (#1–4) and Ron Lim (#5–6). Thanos assembles the six Infinity Gems, snaps his fingers, and erases half of all life in the universe — the premise replicated in Avengers: Infinity War (2018, $2.052 billion worldwide, Josh Brolin as Thanos) and Avengers: Endgame (2019, $2.798 billion worldwide). The Infinity Gauntlet is not covered by our estimator; CGC 9.8 copies of issue #1 trade on the secondary market at levels tracked by GoCollect and ComicConnect.

The Donny Cates run (2017): "Thanos Wins" and the Cosmic Ghost Rider

In 2017, Donny Cates and Geoff Shaw took over Thanos vol.2 from issue #13 (January 2018) with the storyline "Thanos Wins": an aged, broken Thanos rules alone at the end of time, his only servant a Frank Castle who has become a cosmic Ghost Rider. That first appearance of the Cosmic Ghost Rider in Thanos vol.2 #13 immediately captured market attention. Cates subsequently developed the character into his own solo mini-series. For the collector, this issue is the key modern entry point for the franchise — relatively recent, still accessible, but with solid demand tied to the Cosmic Ghost Rider's popularity.

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