The Mongrels are one of the darkest chapters in the long, violent saga of Wolverine's life. Created by Jason Aaron and Renato Guedes, the five Mongrels — Shadowstalker, Fire Knives, Saw Fist, Cannon Foot, and their leader, Gunhawk — were a group of ninja-trained assassins introduced in "Wolverine" Vol. 4 #1 in 2010. The Mongrels were Wolverine's illegitimate children, born from his various relationships over the decades without his knowledge. Gathered together by their half-brother Daken, the Mongrels were employed by a mysterious organization called the Red Right Hand that had a vendetta against Wolverine.
The Mongrels first made themselves known by attempting to kill Logan's then-girlfriend Melita Garner at her workplace and attacking his frequent hangout, the Princess Bar, in Madripoor. Tracking down the Red Right Hand, Wolverine fought the Mongrels one by one, killing them after they refused to stand down.
In "Wolverine" Vol. 4 #14, the Red Right Hand revealed the Mongrels' true identities to Wolverine and that they never intended for the Mongrels to kill him. Every member of the Red Right Hand was the survivor of someone Wolverine directly or indirectly killed, and by forcing him to kill his children, they could make him experience that same suffering. Devastated, Wolverine personally buried the Mongrels at their mothers' gravesites. It is unclear if the Mongrels ever knew of their connection to Wolverine, making their short, brutal lives even more tragic.