A reactor, also called a main reactor or reactor core, was a central power-generation device that was used in space stations and other spacefaring vehicles. The most common reactors included chemical, fission, and fusion reactors, and dated back to the Republic's earliest days. These reactors often required a variety of locally procured fuel sources, while larger starships often utilized fusion systems containing hypermatter-annihilation cores, which generated vast amounts of power. Despite this, most fuel sources were hazardous to organic beings, circulating in ship systems as corrosive liquids or combustible and poisonous gases.
The Death Star and Death Star II, planet-destroying space stations built by the Galactic Empire, both had reactor cores that, when impacted with powerful enough weapons, would explode and destroy the station.
- Star Wars: Episode I The Phantom Menace
- Star Wars: Galactic Defense
- Star Wars: Episode II Attack of the Clones
- Star Wars: The Clone Wars – "Cat and Mouse" (Mentioned only)
- Star Wars: The Clone Wars – "Death Trap"
- Star Wars: The Clone Wars – "Nomad Droids" (Mentioned only)
- Star Wars: Episode III Revenge of the Sith
- Star Wars: Episode IV A New Hope (First mentioned)
- Star Wars 1: Skywalker Strikes
- Star Wars 3: Skywalker Strikes, Part III
- Star Wars 22: The Last Flight of the Harbinger, Part II
- Star Wars 23: The Last Flight of the Harbinger, Part III
- Star Wars 24: The Last Flight of the Harbinger, Part IV (Mentioned only)
- Moving Target: A Princess Leia Adventure (Mentioned only)
- Star Wars: Episode VI Return of the Jedi (First appearance)
- Star Wars: Rey's Survival Guide
- Star Wars: The Force Awakens: Incredible Cross-Sections
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