Fourth-degree droids, also called class four droids, formed a classification of droids programmed for security and military purposes. Fourth-degree models included the B2 super battle droid and the KX-series security droid.
- Star Wars: Episode I The Phantom Menace (First appearance)
- Star Wars Journeys: The Phantom Menace
- Star Wars Journeys: Beginnings
- "Probe Droid Problem"
- Star Wars: Galactic Defense
- Star Wars: Episode II Attack of the Clones
- Star Wars: The Clone Wars film
- Star Wars: Episode III Revenge of the Sith
- Star Wars: Commander
- The Phantom Limb (First identified as class four droid)
- Star Wars Propaganda: A History of Persuasive Art in the Galaxy (First identified as fourth-degree droid)
- Rogue One Rebel Dossier