Action Comics (1938)
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Action Comics #204
DC
•
1955
•
Vol. 1
Non-Key
Action Comics #232
DC
•
1957
•
Vol. 1
Non-Key
Action Comics #233
DC
•
1957
•
Vol. 1
Non-Key
Action Comics #241
DC
•
1958
•
Vol. 1
Introduction of the Fortress of Solitude
A prototype version of Superman's headquarters was introduced in Superman #17 and the name was mentioned in Superman #58
Introduction of the Fortress of Solitude
A prototype version of Superman's headquarters was introduced in Superman #17 and the name was mentioned in Superman #58
Action Comics #275
DC
•
1961
•
Vol. 1
First mention of Superman's Heat Vision power - previous issues demonstrated his X-Ray vision having powers to melt glaciers
Debut of Red/Green Kryptonite - causes mutations including an extra eye on the back of Superman's head
First mention of Superman's Heat Vision power - previous issues demonstrated his X-Ray vision having powers to melt glaciers
Debut of Red/Green Kryptonite - causes mutations including an extra eye on the back of Superman's head
Action Comics #278
DC
•
1961
•
Vol. 1
Non-Key
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