The Mutant Massacre was a Marvel Comics crossover event beginning in 1986. It involved the X-Men, X-Factor, the New Mutants, Power Pack, Thor, and Daredevil. The principle writer was Chris Claremont. Edit
Story
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The Marauders stalk a mutant named Tommy from Los Angeles to New York City in order to find the location of the Morlocks. Once they discover the underground layer of the Morlocks they massacre hundreds of innocent mutants before either the X-Men or X-Factor can arrive to protect the rest. During the ensuing battle, Angel is crucified by Harpoon, and several of the X-Men are severly beaten. Eventually, the Power Pack, the New Mutants and the Mighty Thor arrive to tip the scales in favor of the X-Teams.
Later, Sabretooth of the Marauders follows Wolverine back to the X-Mansion and destroys Cerebro. Then Psylocke confronts Sabretooth who falls off a cliff in order to escape. Wolverine pursues him while Psylocke scans Sabretooth's mind for information regarding the Marauders motives. Eventually, Sabretooth is met by Daredevil in New York City after he gets away from Wolverine, and the two clash in battle.
Years later it is revealed that Gambit lead the Mauraders in their attack under orders from Mr. Sinister (who was never actually mentioned in the original story).
Reading Order
Uncanny X-Men #210
X-Factor #9
Uncanny X-Men #211
X-Factor #10
New Mutants #46
Thor #373
Power Pack #27
Uncanny X-Men #212
Thor #374
X-Factor #11
Uncanny X-Men #213
Daredevil #238 (Unofficial Tie-In)
Issues
The issues included in this crossover are:
Uncanny X-Men
#210
http://www.comicvine.com/comic/the-uncanny-x-men/3092/107057/
#211
http://www.comicvine.com/comic/the-uncanny-x-men/3092/27396/
#212
http://www.comicvine.com/comic/the-uncanny-x-men/3092/27501/
#213
http://www.comicvine.com/comic/the-uncanny-x-men/3092/27691/
X-Factor
#9
http://www.comicvine.com/comic/x-factor/3657/27290/&i=24131
#10
http://www.comicvine.com/comic/x-factor/3657/27399/&i=24131
#11
http://www.comicvine.com/comic/x-factor/3657/27504/&i=24131
New Mutants
#46
http://www.comicvine.com/comic/the-new-mutants/3234/27523/&i=15971
Thor
#373
http://www.comicvine.com/comic/thor/2294/27395/&i=2268
#374
http://www.comicvine.com/comic/thor/2294/27500/&i=2268
Power Pack
#27
http://www.comicvine.com/comic/power-pack/3358/27494/&i=40498
Daredevil
#238
http://www.comicvine.com/comic/daredevil/2190/27676/&i=24694
Associated Issues
Edit
In Los Angeles, a Morlock (Tommy) is fleeing the Marauders. Her companion, a Hellfire thug named Richard, is gunned down, but Tommy escapes back to the NYC. When she gets to the Morlock tunnels, the Marauders (who were tracking her) kill her. Meanwhile, in San Francisco Dazzler (Allison Blaire) is playing in Lila Cheney's band, but she can't use her mutant powers when she's performing anymore ('cause of the mutant hysteria). After a show, she appears to be attacked by someone named Malice. In New York, the X-Men are all dealing with mutant hysteria in various aspects.
