Brad Pitbull was a Vargr slave in the employ of a Set'Awa noble. When the noble's House was chosen to colonize the Proxima Centauri system in preperation of a Jump Tunnel opening up in the future he was part of the slaves included in the entourage.
Brad's speciality was being dropped into hostile alien environments and exterminating anything that could be a threat to his noble's House. Brad was a know acquaintance of John Reikerk.