Fan Casting Starkiller/Galen Marek in Star Wars: The Original Trilogy

In the end-credits scene of this potential remake of Return Of The Jedi, it would be revealed that Darth Vader had a secret Sith Apprentice of his own named Galen Marek, codenamed "Starkiller", that soon learned of the demise of his Master and now plans to exact his revenge on Luke Skywalker, believing that Vader fell at the hands of the Jedi alongside Palpatine.