Marvel & DC Key Comic Issues
Explore 279 collector guides covering major and minor Marvel & DC comic milestones.
Major Key Comic Issues
Browse major milestones, debuts and defining comic-book keys.
279 major key issues
Major Key
Action Comics #241
First appearance of the Fortress of Solitude in its classic Silver Age form.
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Major Key
Action Comics #242
First appearance of Brainiac and the bottled city of Kandor.
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Major Key
Superman #123
Early prototype appearance that helped lead to the Silver Age Supergirl concept.
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Major Key
Wonder Woman #98
Beginning of the Silver Age reworking of Wonder Woman’s origin and mythology.
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Major Key
Adventure Comics #260
Silver Age origin establishing Arthur Curry's Atlantean heritage.
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Major Key
Showcase #22
First appearance of Hal Jordan and the Silver Age Green Lantern concept.
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Major Key
The Brave and the Bold #25
First appearance of the original Suicide Squad.
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Major Key
Wonder Woman #105
Introduces Wonder Girl as a younger version of Diana in a key Silver Age development.
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Major Key
The Brave and the Bold #28
First appearance of the Justice League of America.
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Major Key
Fantastic Four #1
In stock
First appearance and origin of the Fantastic Four.
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Major Key
The Flash #123
'Flash of Two Worlds' establishes DC's multiverse concept.
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Major Key
Amazing Fantasy #15
First appearance and origin of Peter Parker/Spider-Man.
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Major Key
Tales to Astonish #27
Hank Pym's first appearance, before adopting the Ant-Man identity.
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Major Key
Tales to Astonish #35
First appearance of Hank Pym as Ant-Man in costume.
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