I'll always remember the surprise I felt the first time I saw the famously bratty voice of Bart Simpson emerge from the mouth of a little blonde woman, voice actor Nancy Cartwright. I knew Bart was voiced by a woman, but knowing it didn't make it any less weird to see it. I had a similar experience of cognitive whiplash the first time I saw the voice of sweet little Elmo come out of the mouth of the burly Kevin Clash. I expect to repeat that experience of whiplash at least a dozen times when I watch the forthcoming documentary, I Know That Voice, an upcoming documentary that features some of the best-known voice actors in animation, video games and more talking about their craft. You can watch the trailer after the cut.The actors interviewed in this documentary are some of the unsung superstars of pop culture. John Di Maggio and Billy West are perhaps best known for their roles on Futurama, where they play Bender and almost everyone other character, respectively. Tom Kenney is SpongeBob SquarePants; June Foray is Rocky from Rocky and Bullwinkle; and Kevin Conroy is the Batman voice actor against whom all other Batman voice actors are measured. Perhaps best of all is Tara Strong, who voices Twilight goddamn Sparkle in My Little Pony: Friendship is Magic. Bow down, bronies (and everyone else, for that matter). Most of these talents have played more superhero roles than all the best known stars in Hollywood put together.

I Know That Voice is currently slated for a 2013 release.