Inferno was a Marvel Comics company-wide crossover in 1989 that mainly involved the mutant titles, namely The Uncanny X-Men, X-Factor, X-Terminators, Excalibur, and The New Mutants. The story concerned the corruption of Madelyne Pryor into the Goblin Queen, the final transformation of Illyana Rasputin into the Darkchylde, the demonic transformation of Hobgoblin, and a demonic invasion of New York City. The series was written by Louise Simonson, Chris Claremont, Steve Engelhart, Gerry Conway, David Michelinie, Ann Nocenti, Walter Simonson, Jon Bogdanove, Terry Austin, and Julianna Jones.