An alternate ending for Star Wars Episode III: Revenge of the Sith was created by Hyena117.
Plot summary
In this alternate ending, the Galactic Republic join with the Confederacy of Independent Systems in launching Order 66, as the two sides now have the same enemy. The twins, Luke and Leia, are not separated, and Anakin Skywalker does not fall to the dark side of the Force. Rather than falling, Skywalker is almost expelled from the Jedi Order, but is kept due to being a powerful warrior. Padmé Amidala leaves the Galactic Senate and is trained to become a military commander.