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Three Mile Island is a nuclear power plant located in the Susquehanna River, south of Harrisburg, Pennsylvania.
During the 1970s, it served as a mutant prison run by William Stryker and his team of scientists, where they experimented on and combined the mutants' powers for the Weapon X and Weapon XI programs. The facility was destroyed in 1979 following a battle between Wolverine, Sabretooth and Deadpool.
- In reality, the Three Mile Island Incident didn't result in the destruction of a reactor.