Twilight Sparkle, Magical student extraordinaire turned Alicorn Princess looks up into Luna's night sky every night, wondering if there is more to life than what she knows on Equis. Silently, she wishes for an answer to her burning desires. And the universe answers in the form of a Sith Lord.
Darth Sidious believed Starkiller to be a broken shadow of himself after he betrayed both his master and his allies alike, a broken shell, weaker than he could have been. But Little does he know that like Vader, technology didn't extinguish the flames of desire and purpose in him. Starkiller has biden his time, waiting for the right moment to strike against the Empire; now after finding himself in a strange new world untouched by the empire or the Preluding Clone Wars, he has discovered a race fully capable of fighting against the Empire, or at least the Emperor himself.
The former Secret Apprentice of Darth Vader has found himself in a word untouched by the Clone wars and undiscovered by the all-seeing Sith Emperor, Darth Sidious. Darth Starkiller sees this world as a chance to change his standing in the Empire.
Good equivalent of the story. What if Starkiller wasn't the broken apprentice of Darth Sideous, but the liberated clone of Vader's Apprentice? How differently would things be?