At some point in the past, Gregory Terraerton was seemingly killed by "the merc with the mouth" Deadpool.^[1]

Years later, he somehow came back to life as Slayback and used stolen Weapon X files on Kane and Deadpool to kidnap Copycat^[2] in order to use her as bait to find and kill Deadpool for killing him earlier.

He was subsequently seemingly killed by Zero (an A.D.A.M. unit).^[3]

Slayback once hired himself out to a scientist group who wanted to use Deadpool's healing factor as a possible cure for the Legacy Virus. He enjoyed carving on his old friend Wade's chest during the experiments.^[4]

He was later revealed to be alive, but he was killed by Sharp after test subjects from the Weapon X program escaped,^[5] and went to Hell.^[6]

• Cyber-Morph: Slayback has expandable and extendable bionic arms and sharp talons that he can reshape into a single point.^[8]
• Superhuman Speed^[3]
• Superhuman Strength: His bionics afford him enhanced strength.^[8]
• Regenerative Healing Factor: His healing factor can reconstitute his entire body.^[8]

• Hand-to-Hand Combat: He is an expert hand-to-hand combatant.^[8]