The Mutant Massacre or the Morlock Massacre was a major crossover, which took place during the summer of 1986. It primarily involved the X-Men and X-Factor, and the New Mutants, Power Pack, Thor, and Daredevil crossed over for a few issues in their own comic books.
The mysterious Marauders attack a mutant named Tommy and her Hellfire Club boyfriend Richard Salmons in Los Angeles for the purpose of following her back to New York and finding the location of the underground mutant community known as the Morlocks. They kill Tommy and hundreds of Morlocks, before the separate arrivals of the X-Men and X-Factor fight the group of murderers and save scores of innocent Morlocks from death. The two teams however do not meet during the battle and suffer crippling losses: X-Factor's Angel is crucified by the Marauders while Colossus, Shadowcat, and Nightcrawler are all severely wounded as well. X-Factor's casualties are less due to the arrival of Power Pack and Thor, who help save the horribly wounded Angel and the rest of X-Factor from suffering any additional harm.
Thor uses his powers to cleanse the dead from the Morlock tunnels with fire, which causes problems for the X-Men, who briefly believe that the firestorm was caused by the Marauders and believe that the New Mutants died in said fire.
Meanwhile the Marauder Sabretooth and X-Man Wolverine fight and Sabretooth follows Logan home to the X-Mansion. He destroys Cerebro, but is kept from hurting the other Morlocks when Psylocke engages Sabretooth in battle. Wolverine and the rest of the X-Men arrive and Sabretooth falls off a nearby cliff in order to escape the X-Men, pursued into the water by Wolverine. As the fight continues in the ocean, Psylocke is able to glean some information about the Marauders from Sabretooth's mind, including information about Mr. Sinister.
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