“We still don’t know the precise parameters of the role Darth Vader will play in Rogue One. Most of the rumors have him as a prominent player in a few scenes and something to fear for the heroes. If it amounts
He was supposedly resurrected in 0 BBY by three Prophets of the Dark Side for the purpose of presenting a worthier successor to Darth Sidious than his current apprentice, Darth Vader. A showdown was staged on Kalakar Six, and the two Sith Lords fought to see who would rule the galaxy ...
Another idea involved the Secret Apprentice, the main character, sent to find Plagueis as part of a plot by Darth Vader to resurrect Padmé Amidala. Still other ideas included revealing that the Apprentice was Plagueis reborn, or using a reformed Plagueis as the Apprentice's mentor.[43] ...