X-Men, but X-Factor writer Louise Simonson felt that such a big storyline would run overlong in a single title, and suggested that it be done as a crossover between all three mutant titles. Claremont and Simonson, the chief writers of the crossover, exchanged copies of their typewritten plots and scripts, and extensively discussed the intersecting storylines over the telephone. Asked what it was like to coordinate all the Mutant Massacre-linked stories, Simonson said "It was horrible. I don't know why we're thinking of doing this again." Walt Simonson, who wrote the Thor instalments of "Mutant Massacre" and pencilled the X-Factor instalments, said: Collected editions In other media In The Gifted episode "calaMity", The Purifiers murdering all of the Morlocks in their tunnels was the premise of the "Mutant Massacre" storyline. References External links Mutant Massacre— guide by Mike Phillips. Comics by Chris Claremont Comics by Louise Simonson Comics by Walt Simonson New Mutants