(CNN) -- They are the famous voices. The actors whose names and faces you may not know -- but they're aiming to change that.
Every July, at San Diego Comic-Con, voice actors enjoy major celebrity status along with A-list stars who do on-camera acting. It's a welcome change for the never-seen actors who may usually go unnoticed.
Following CNN's 2012 interviews with several voice actors, John DiMaggio (best known as Bender on "Futurama" and Jake on "Adventure Time") had been finishing work on a documentary that sought to pay tribute to those unsung famous voices behind animated icons.
"I Know That Voice," is set to make a splash with a Comic-Con panel Thursday, and features interviews with multiple generations of voice-over artists including Tom Kenny (SpongeBob Squarepants) and 95-year-old June Foray (Rocky the Flying Squirrel).
CNN recently spoke with DiMaggio, and the film's director Lawrence Shapiro, as well as veteran voice actress Tara Strong from the new animated series "Teen Titans Go!" Strong is also known for her work on "Rugrats," "Powerpuff Girls," and "My Little Pony: Friendship is Magic."
("Adventure Time," "Powerpuff Girls" and "Teen Titans Go!" all air on Cartoon Network which, like CNN, is a subsidiary of Time Warner).
CNN: Where did the idea for this documentary originate?
John DiMaggio: Larry [Shapiro] and I were in Amsterdam for a thing we've been doing for a long time called "Jam in the 'Dam." We'd just been talking about stuff we wanted to do and Larry said we should do something about voiceover. "I Know That Voice" came from that.
Shapiro: You'd see people enjoy John on one level as an emcee, then he would bust out a voice like Bender and you'd see everyone's jaw drop.
DiMaggio: I got a bunch of people I work with on a regular basis to come talk to us. I owe a lot of people a lot of favors now, so I'm screwed.
I kind of wanted to make a valentine to the folks I work with, and give a little face-time to these folks who entertain so many people all of the time and don't really get credit.
It is a close-knit group of people, and it's a group of actors that really look out for each other. It's a competitive industry and these people are the least competitive and some of the most talented. It's just a really good group of people and that's what we wanted to show in the film.
Strong: We all know each other and we see each other wherever we go. It's usually the same 10 or 20 people on every show at a time. The nice thing about the voice acting community is there's this camaraderie, we know there's work for everyone. You don't get the same sort of cattiness that you'd get on camera. It's not about what you look like. I'm pretty amazed by voice actors every day.
CNN: How often do you get recognized?
DiMaggio: People are starting to recognize me at these conventions, but as soon as I walk away from the convention, people don't really know who I am, which is great because I love flying under the radar.
Strong: Anytime around the conventions, we're suddenly superstars.
DiMaggio: You get these more mainstream projects and suddenly you're walking down the street and someone says, "Hey man you do that voice!" That's a strange thing. I didn't get into this business to be famous; I got into this to work.
CNN: Do you ever breathe a sigh of relief when you see on-camera celebrities getting mobbed?
DiMaggio: Yeah, do I really want to have to invest in hand sanitizer? I'm good.
CNN: How easily can you call upon all of your various characters?
Strong: Once I create a character, they live up there in my head.
Some people say, "I want to get into voice acting because I have an interesting voice," but there's so much more to it than that, bringing characters to life through your acting abilities. I don't even know where they come from half the time, they're in there -- whenever it's time to play, they come out and they don't get mixed up.
CNN: What do you think of the rise of "name" actors getting involved in animated features after the success of "Aladdin," "Shrek" and "Madagascar?"
DiMaggio: That's a difficult call, from a producer's standpoint you want to bring in names just to create a buzz. Sure, but in the long run, kids don't really care who's doing the voice as long as it's good.
It's a constant dilemma that we in the trenches have to deal with all the time. They're starting to cast names a lot more in cartoons, because a lot of people are becoming hip to the job. "Really, I don't have to go to the makeup trailer and wait 10 hours to shoot one scene?" It's an interesting thing that names are coming out of the woodwork. But if you're a producer, if you want to make money, you gotta spend money, I suppose, in that vein. There's enough to go around I think.
Strong: I've been doing it for over 25 years and others doing it even longer. Sometimes they'll give millions of dollars to an on-camera celebrity who isn't as convincing as one of the voiceover greats. It's nice to see (voiceover actors) get more recognition, that's for sure.