"Last year, with the Reverse-Flash, we just modulated Tom Cavanagh’s voice, and this year we wanted to do something a little bit different. Part of the mystery of the season is who or what is underneath the Zoom outfit, and so we wanted to do something like James Earl Jones as Darth Vader — this iconic voice coming out of this mask. Last year, we thought of the Reverse-Flash as a speed warrior; this year, Zoom is like a speeddemon, and no one does demon-voice better than Tony Todd."
Tony Todd will voice Zoom on the show.
“The Zoom outfit is much more organic than the Reverse-Flash suit,” Kreisberg teases of what we’ll see when the character makes his re-introduction in episode 2×02, “Flash of Two Worlds.” “In a way, it’s hard to tell if it is a suit or alive… There’s no skin showing, for all you know there’s a robot underneath, or dark energy.”
Season 2 of The Flash is set to air October 6, 2015