Actor Tom Cavanagh, who plays The Flash's Dr. Harrison Wells/Reverse Flash revealed the finer points of developing a proper supervillain voice in a new interview with Rolling Stone.
"If you're doing it right, you can be charismatic, you can win people over, and you can have so much fun," Cavanagh says. "You build a cage and then you just rattle that cage more than the leading guy can a lot." One benefit to playing a supervillain is that there's no requirement to be handsome, Cavanagh points out.
In order to take your supervillain character to the next level, Cavanagh recommends using a gruff, lowered voice à la Christian Bale in The Dark Knight trilogy. Although, he cautions, using a harrowed voice also makes it ridiculously difficult to communicate from 50 feet away.