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Character
Storm first appeared in Giant-Size X-Men #1, cover-dated May 1975, from Marvel Comics, created by Len Wein and Dave Cockrum. Nightcrawler, Colossus and Thunderbird debut in the same issue; X-Men #94 (August 1975) is the new team's first regular issue.
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First appearance, key issues and what drives the prices.
Characters
Storm first appeared in Giant-Size X-Men #1, cover-dated May 1975, by Len Wein and Dave Cockrum — the issue that also introduced Nightcrawler, Colossus and Thunderbird and brought Wolverine, Banshee and Sunfire together as the new X-Men. The regular series resumed with X-Men #94 (August 1975), which began Chris Claremont's sixteen-year run as writer.
Updated Sep 14, 2026
Key issues
Both. Giant-Size X-Men #1 (May 1975) introduces the new team — first appearances of Storm, Nightcrawler, Colossus and Thunderbird — and is the more valuable book. X-Men #94 (August 1975) is the first regular issue of the new team, the first issue written by Chris Claremont, and the start of the run that made the X-Men Marvel's best-selling franchise. Collectors treat Giant-Size #1 as the first appearance key and #94 as the first-issue key.
Updated Sep 14, 2026