| X-Men: Hidden Years (1999)
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Publication Date: December 1999 - September 2001
Country: United States
The series attempted to fill in the period in the late 1960s and early 1970s when the original X-Men comic was publishing only reprints of earlier issues. The series was intended to fill in the team's chronology during the reprint issues of the original X-Men series (#67-93).
Number of issues cataloged: 25