The Rebellion was a movement dedicated to vanquishing the Galactic Empire, and restoring freedom and peace to the galaxy. It was made up of different rebel cells and militias across the galaxy on their own initiative, but coordinated as a larger movement in secret by Senator Bail Organa and former Jedi Padawan Ahsoka Tano. It was the predecessor movement to the Rebel Alliance.

The Rebellion was loosely formed some time after the end of the Clone Wars, in which Supreme Chancellor Palpatine—secretly Darth Sidious—declared himself Emperor and transformed the Galactic Republic into the Empire. The Rebellion, led by Organa and Ahsoka, founded rebel cells throughout the galaxy and secretly worked to feed them missions to undertake against the Empire while maintaining all cells’ low contact between them in order to avoid Imperial crackdown. One such cell, Ghost Crew came to Organa’s attention after they successfully stopped an arms deal involving illegal T-7 ion disruptor rifle. Organa had sent his two droids, R2-D2 and C-3PO, to handle the weapons, and the droids encountered the Ghost crew. R2 recorded much of his time with the crew and, once they were returned to Organa, presented the senator with his recordings. After the encounter, the crew received missions from Ahsoka, operating as Fulcrum, though only the owner of the Ghost, Hera Syndulla, knew Fulcrum’s identity or any information about the Rebellion.