The growing use of AI, or synthetic voices, has the potential to be the most disruptive technology in voice acting since, well … ever. However, the Uncanny Valley phenomenon first described in 1970 by a Japanese roboticist describes that the closer synthetic human speech gets to perfection, the less comfortable we are with it ... until it becomes actually indistinguishable from real humans. We'll define the Uncanny Valley, discuss how it applies to human voice, and make some guesses as to the future of synthetic voices in the world of voiceover. This situation we face with AI is not new - roboticists have been dealing with it for 50 years Synthetic voices are unlikely to replace us as voice actors any time soon. There are many skills that voice actors bring to their performances that it will be difficult for AI/synthetic voices to emulate.