A venerable if maverick Jedi Master, Qui-Gon Jinn was a student of the living Force. Qui-Gon lived for the moment, espousing a philosophy of "feel, don't think -- use your instincts." On Tatooine, Qui-Gon discovered a young slave boy named Anakin Skywalker who was strong in the Force. Sensing the boy's potential, Qui-Gon liberated Anakin from slavery. The Jedi Master presented Anakin to the Jedi Council, but they deemed the boy too old to begin training and dangerously full of fear and anger. They refused to allow Qui-Gon to train Anakin, but rescinded their decision to fulfill Qui-Gon's dying wish.
A noble order of protectors unified by their ability to tap into the power of the Force, the Jedi Order were the guardians of peace and justice in the Galactic Republic. The age of the Jedi would end, however, due to a nefarious plot by the Sith Lord Darth Sidious.
Scheming, powerful, and evil to the core, Darth Sidious restored the Sith and destroyed the Jedi Order. Living a double life, Sidious was in fact Palpatine, a Naboo Senator and phantom menace. He slowly manipulated the political system of the Galactic Republic until he was named Supreme Chancellor -- and eventually Emperor -- ruling the galaxy through fear and tyranny.
Umbara, known as the "Shadow World" due to the rays of its sun never completely reaching its surface, is perpetually dark. The native wildlife have adapted to survive in such gloom, making the planet perpetually dangerous. Umbara was once part of the Galactic Republic, represented in the Senate by Senator Mee Deechi. Later in the Clone Wars, the planet's loyalty wavered and the natives of Umbara allied themselves with the Separatists, bringing their extremely advanced technology to the Separatist Alliance.
The lightsaber is the weapon of a Jedi, an elegant weapon of a more civilized age. It can be used to cut through blast doors or enemies alike. Using the Force, a Jedi can predict and deflect incoming blaster bolts, and reflect them.