The 60-year-old "Final Destination" actor will voice Zoom, who will menace titular hero Barry Allen (Grant Gustin) beginning in episode two, "Flash of Two Worlds", reported Variety.
"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...
"So we wanted to do something like James Earl Jones as Darth Vader... Zoom is like a speed demon, and no one does demon-voice better than Tony Todd," executive producer Andrew Kreisberg said.
Other additions to "The Flash" season two include Keiynan Lonsdale as future speedster Wally West, Teddy Sears as Jay Garrick, and Shantel VanSanten as Patty Spivot.
"The Flash" season two will premiere on October 6.