The IG-series was a series of droids manufactured by Holowan Laboratories during the final years of the Galactic Republic, and were used as both bodyguards and assassins. A notable example was IG-88, who functioned as a bounty hunter during the Galactic Civil War.
- Star Wars in 100 Scenes (First identified as IG-series)
- Ultimate Star Wars
- Star Wars Character Encyclopedia: Updated and Expanded
- Star Wars: ABC-3PO
- Star Wars: Complete Locations
- Star Wars: Galactic Atlas