Madripoor
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Debut
New Mutants #32 (1985)
There was a time when the streets of a world of heroes and villains whispered a single name: Madripoor. No monument marks it now, yet every old copy of every old paper still remembers.
Significant Issues
Wolverine, Seraph, & Captain America vs Hand/Nazi alliance during World War II (Uncanny X-Men #268, 1990); New Mutants searched for Karma (New Mutants #32, 1985); gang war between Roche & Tyger Tiger (Marvel Comics Presents #1-10, 1988-1989); gang war between Tyger Tiger & Coy (Wolverine #4-7, 1989); New Mutants opposed Mutant Liberation Front activities (New Mutants #93-94, 1990); Corrigan, O'Donnell, Rose, Baran, Coy, & Tai all killed (Wolverine #98, 1996); attempted takeover by Hydra & The Hand foiled by Viper (Wolverine #126-128, 1998); Wolverine participated in Bloodsport tournament (Wolverine #167-169, 2001); became beachhead of attempted alien invasion of Earth (X-Treme X-Men #10-18, 2002)
All data from the awesome folks at Marvel.