Marvel Comics supervillain Thanos made his first appearance in The Invincible Iron Man #55 (February 1973) and was created by writer-artist Jim Starlin
Avengers #125 -Marvel Chronology Thanos Reading Order: The Comic Source Podcast - The Comic Source Blog
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Rebirth of Thanos (1990-1991) Reading Order – Omniverse Comics Guide
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Thanos Wins, Event
Thanos Reading Order