Uncanny X-Men Vol.1 #239
Strange occurrences are happening all over the city of Manhattan. Mr. Sinister plots and schemes from the shadows. The X-Men are betrayed by one of their own. And, the Marvel Universe is about to engulfed by an all encompassing evil from which no one will escape. Welcome to the Inferno!
Printed: Dec 1988
Writers: Chris Clairemont
Art: Marc Silvestri and Dan Green
Cover: Marc Silvestri and Dan Green