The IG-88 assassin droid, which is also referred to as the IG-88 series droid, represented a specific model within a group of five identical assassin droids that were created by Holowan Laboratories. Once activated, these droids committed a massacre, killing their creators, and subsequently fled their laboratories, dispersing into the galaxy.
One particular droid, designated IG-88B, was an IG-88 assassin droid that had its own independent programming. It functioned as a war droid and gained notoriety as a bounty hunter. It was commonly known just as IG-88. Additionally, IG-88D and IG-88C were also IG-88 series droids that operated as bounty hunters. Meanwhile, IG-88A had a scheme to eliminate all organic life.