Inferno

1989

Madelyne Pryor is revealed as a clone of Jean Grey created by Mr. Sinister, and she transforms into the Goblin Queen, opening a demonic portal over New York City. As demons overrun Manhattan and inanimate objects come to life, the X-Men and X-Factor must confront Sinister's manipulations, Illyana Rasputin's ties to Limbo, and the truth about Madelyne's origins. The event resolves long-simmering plotlines and permanently alters the X-Men's status quo.

9 core issues, 5 optional tie-ins/crossovers

The Uncanny X-Men #239

Mr. Sinister's machinations; Madelyne Pryor's transformation begins

The Uncanny X-Men #240

Madelyne becomes the Goblin Queen

The New Mutants #71

Illyana struggles with Limbo's influence

The Uncanny X-Men #241

The New Mutants #72

The Uncanny X-Men #242

X-Men and X-Factor clash; Jean Grey confronts Madelyne

The New Mutants #73

Illyana sacrifices her Darkchilde powers; reverts to childhood

The Uncanny X-Men #243

Final battle with Mr. Sinister; X-Men destroy his base beneath the orphanage

Inferno's demonic influence reaches Britain