Agreed no Vader without James Earl Jones. His intense scary voice made Vader the ultimate badass he is. Some suggest it will take place after Return of the Jedi. This would require a merging of the entire original cast which I don't think is possible. My favorite idea would be a series taking place inbetween Revenge of the Sith and A New Hope. Showing the early days of the Rebelion and Vader hunting down the early Jedi.