IG-88, also known as the IG-series assassin droid or IG-series combat prototype, was an assassin droid line designed by Holowan Laboratories. The IG-88 line was a derivative of the IG-86 sentinel droids used during the Clone Wars. IG-88B later became one of the galaxy's most infamous bounty hunters. However, the bounty hunting was just a cover for his master, IG-88A, and his grand plan—the Droid Revolution.