Marvel & DC Key Comic Issues
Explore 345 collector guides covering major and minor Marvel & DC comic milestones.
345 published key issues
Major Key
Avengers #227
Monica Rambeau formally joins the Avengers, establishing her as a full member of the team.
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Minor Key
Batman #366
Jason Todd begins operating as Robin in the post-Crisis predecessor continuity.
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Major Key
Thor #338
Beta Ray Bill’s worthiness leads to a decisive contest over the power of Thor.
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Major Key
Amazing Spider-Man #252
First appearance of Spider-Man's black costume in the main title.
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Major Key
Batman #368
Jason Todd formally takes over as Robin in the pre-Crisis era.
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Major Key
The Saga of the Swamp Thing #21
'The Anatomy Lesson' radically redefines Swamp Thing.
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Major Key
Thor #339
First appearance of Stormbreaker, Beta Ray Bill’s enchanted hammer.
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Major Key
Avengers #257
First appearance of Nebula, the spacefaring villain who claims a connection to Thanos and becomes a recurring figure in Marvel’s cosmic stories.
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Major Key
Crisis on Infinite Earths #7
Pivotal sacrifice of the pre-Crisis Supergirl.
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Major Key
Iron Man #200
Tony Stark returns to the Iron Man role in a major confrontation with Obadiah Stane.
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Major Key
The Saga of the Swamp Thing #37
First full appearance of John Constantine.
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