The IG-series was a line of battle and assassin droids produced by Holowan Laboratories and its subsidiary, Holowan Mechanicals, though some of their components (including the head parts) were in fact of Incom Corporation make. Assassin droids were illegal for centuries, under the Galactic Republic. After having found success in the last years of the Republic and during the Clone Wars, the designers at Holowan Laboratories believed they would be able to control their overpowered IG-88 assassin droid line, but the programming was faulty.