A 1986 Marvel crossover involving the X-Men, X-Factor, and New Mutants. Written by Chris Claremont, Louise Simonson, and Walter Simonson with art by John Romita Jr. and Sal Buscema.
The Marauders, mercenaries hired by Mister Sinister, attack the Morlocks living in New York City's sewers. The event spans Uncanny X-Men #210-213, X-Factor #9-11, New Mutants #46, and Thor #373-374. Several key characters are injured, including Angel who loses his wings.