Board Thread:Questions and Answers/@comment-11255996-20130721105715/@comment-1409915-20131112175745

Chillmanfire wrote: I feel that it will be Yuri Lowenthal, because Tara Strong made the voice of Upgrade in the original series, and his voice was young Ben's. Now, it will probably be teen Ben's voice.

You're right. It's almost like Nanomech. Because of the techno-organic nature of Upgrade Ben's not completely Upgrade like all the other aliens. Therefore there's still a more of him to fill Upgrade unlike the other aliens.

That made no sense so how about this.

Since Upgrade is half techno half organic Ben can only become the half organic part. Therefore Ben as Upgrade is still half himself and so has his own voice, just with a techno-autontuny feel to it. As Ben is the voice of Upgrade and Tara Strong played both then Yuri Lowenthal will, and has, voiced Upgrade in Omniverse.

The information of how Upgrade is and why his voice is that way were revealed in pop ups leading up to the preimiere of Alien Force all those years ago.