Sam Witwer and Rahul Kohli took part in an IGN organised watch party for Star Wars: The Empire Strikes Back, during which Witwer discussed what would have happened in The Force Unleashed III.
When asked about LucasArts’ plans for The Force Unleashed III, Witwer revealed how the sequel would have picked up from the ending of the previous game (which showed Starkiller defeating Darth Vader and leaving to bring Vader into Rebel custody). The short answer? Starkiller would have discovered his former master is far more devious and powerful than he realized.
“At the end of The Force Unleashed II he cuts off Vader’s hand and captures him,” said Witwer. “I’m not comfortable sharing everything we discussed, but the idea was, that was the biggest mistake ever, and that Vader, like he was toying with Luke, the Force Unleashed I and II games were all about Vader toying with Starkiller. And at some point, there would be a confrontation where Starkiller’s fighting Vader, and everything that worked before suddenly isn’t working now. He’s like, ‘I cut off your hand!,’ and Vader says, ‘That wasn’t my hand. I have no hand.'”
Witwer continued, “Starkiller’s fighting and Starkiller says, ‘How are you doing this?’. Vader answers simply with whatever the first line in the original Star Wars script was, which I believe was, ‘I am Lord Darth Vader, Dark Lord of the Sith.’ It was something along those lines, and that ends the conversation. He’s no match for this guy. There’s a little spoiler for an alternate universe.”