R4-I9 was an R4 agromech droid painted a dark blue. It was owned by the Galactic Empire. R4 patrolled the halls of the first Death Star during 0 BBY, where it performed maintenance tasks. Years later, a rebel attack onboard the second Death Star, left corridors in flames and R4-I9 immobilized. R4's ally R2-Q5 was forced to download an important message for the Emperor from R4's memory banks and deliver it personally.