With Gina Carano cast as the Morlock Angel Dust in the Fox's upcoming Deadpool movie, who's to say what sort of role the tunnel-dwelling mutants will play in the film? Either way, now's a good time to brush up on the Morlocks.
X-Men: Mutant Massacre (Chris Claremont, Louise Simonson, Walter Simonson, John Romita, Jr., and Sal Buscema) - This X-Men crossover sees the villainous mutant group The Marauders (whose ranks include Sabretooth, Harpoon, Scalphunter and Riptide) slaughter many of the Morlocks in the tunnels beneath New York before the combined efforts of the X-Men and several allies take them on to stop them. There are many consequences to this battle that were felt throughout the Marvel Universe.
Uncanny X-Men: What Happened To Kitty? (Chris Claremont and John Romita, Jr.) - In issue #179 of Uncanny X-Men, the Morlocks kidnap Kitty Pryde to get her to fulfill her promise upon their first meeting: to marry Caliban. Features the terrible powers of the Morlock Masque. This is also collected in Essential X-Men (Volume 4).
Morlocks (Geoff Johns and Shawn Martinbrough) - A four-issue mini-series from 2002, this is where Angel Dust first appears, joining the Morlocks of Chicago after her mutant powers kicked in, and battling with the mutant-hunting sentinels.
Uncanny X-Men: All-New, All-Different...Here We Go Again (Chris Claremont and Jim Lee) - In Uncanny X-Men #254, Muir Island is under siege by the Reavers, the island now hosting several morlocks. Meanwhile Callisto, in New York, is captured and tortured by Masque, who has taken leadership of the Morlocks.
Uncanny X-Men: The Extremists (Ed Brubaker and Salvador Larocca) - The X-Men investigate attacks in the Morlock tunnels as Masque reclaims leadership of the Morlocks.