To be fair to Epic’s attempt at an AI implementation, Darth Vader is a deeply evil character (i.e. murders sandpeople, hates sand), and the remarks seem consistent with his twisted and sadistic personality. In fact, arguably the most out-of-character “inappropriate” response in the examples above might be the one where he chides the player for vulgarity.
These aren’t the words you’re looking for
Getting an AI character to match the tone or backstory of an established fictional character isn’t as easy as it might seem. Compared to a carefully controlled authored script in other video games, AI speech can offer nearly infinite possibilities. Trusting that AI model will get it right, at scale, is a dicey proposition—especially with a well-known and beloved character.
In that sense, the vulgar Vader situation creates a touchy dilemma for Epic Games and Disney, which likely invested substantially in this high-profile collaboration. While Epic acted swiftly in response, maintaining the feature while preventing further Jedi mind tricks from players presents ongoing technical challenges for interactive AI speech of any kind.
AI language models like the one constructing responses for Vader are fairly easy to trick with exploits like prompt injections and jailbreaks, and that has limited their usefulness in some applications. Imagine a truly ChatGPT-like Siri or Alexa, for example, that could be tricked into saying racist things on behalf of Apple or Amazon.
David Prowse as Darth Vader and Carrie Fisher as Princess Leia filming the original Star Wars.
Credit:
Sunset Boulevard/Corbis via Getty Images
Beyond language models, the AI voice technology behind the AI Darth Vader voice in Fortnite comes from Respeecher, a Ukrainian startup we covered in 2022 that creates new conversations from revitalized old voice recordings. It uses an AI model trained on examples of speech from voice actors that can then synthesize new speech in the same style.
Respeecher previously worked with Lucasfilm on The Book of Boba Fett to recreate young Luke Skywalker’s voice and on Obi-Wan Kenobi for Darth Vader’s voice performance.
According to Variety, Jones’ family supported the Fortnite collaboration, stating: “James Earl felt that the voice of Darth Vader was inseparable from the story of Star Wars, and he always wanted fans of all ages to continue to experience it. We hope that this collaboration with Fortnite will allow both longtime fans of Darth Vader and newer generations to share in the enjoyment of this iconic character.”
