Operation Womp Rat
IG-88 is known as the second best bounty hunter in the galaxy—second only to Boba Fett.
IG-88B was created by IG-88A, the first of the IG-88 assassin droid models, created at Holowan Laboratories as part of a secret Imperial project.
IG-88A believed that he was superior to organic beings, and, when the scientists in the lab—concerned with his rapidly propagating memory—attempted to shut him down, he slaughtered them. IG-88A then activated the other three IG-88 models in the lab, transferring his consciousness to their droid brains and linking the four droids with a single mind.
IG-88B embarked on a bounty hunting career to draw attention away from IG-88A, who remained on Mechis III, supervising production and preparing for galactic control.