ED-4 was a slicer droid who was one of the three droid brains that made up the computer of the starship Millennium Falcon. The other two were known as V5-T and L3-37. Long before the Millennium Falcon was known to Lando Calrissian or L3-37, the droid's consciousness was uploaded onto the ship to join V5-T, who had been the first to join the Falcon.
- "Faith in an Old Friend"—From a Certain Point of View: The Empire Strikes Back (First appearance) (First identified as ED-4)
- Star Wars: The Last Jedi: Expanded Edition (Indirect mention only)
- Star Wars: The Last Jedi: Expanded Edition audiobook (Indirect mention only)
- Star Wars: Absolutely Everything You Need to Know (First mentioned) (Indirect mention only)