AC-38, known as "Ace," was a pilot droid from the AC-series pilot droid line. A renegade protocol droid commandeered his StarSpeeder, leading to a perilous journey through the galaxy. Following this event, every AC-series unit was decommissioned and substituted with RX-series droids, which demonstrated only marginally improved dependability. Speculation suggested that Ace's employer reassigned him to cleaning tasks as a result of what happened.