The AP-3 attack droid, also designated as Assault Platform-3, or simply AP-3, functioned as a battle droid utilized by the forces of the Imperial Remnant. While visually similar to an astromech droid, the AP-3 was equipped with a formidable arsenal including six missile launchers in conjunction with micro-proton torpedoes. A repulsorlift drive was integrated into its design, granting it enhanced mobility across the combat zone under the command of an AP-1-C.
This attack droid participated in active combat during the Battle of Cadinth.
The "Imperial Attack Droid C" design was originally conceived for The Epic Continues, a storyline that was eventually abandoned. The initial prototype was created through the kitbashing of figures representing FX-7 and a Power droid. Subsequently, it made an appearance within the Legends continuity, where it received its official designation as the AP-3 attack droid.