So there's this voice actor called Rob Paulsen. You've definitely heard his work: he's probably most notable as a major contributor to Animaniacs (Yakko Warner, Pinky, and a bunch of other voices, like hundreds of other parts), but just skim through his TV credits: he's even got more than Willam.

And he once told a story in an interview that absolutely broke my heart.

See, the voice actors are what make animation work. Without them, there is no show. But voice actors get zero respect. Literally none. It's not at all uncommon for the voice actors, even if they voiced one of the marquee characters (as in, they literally voiced Busby in a film called Busby), to not even get invited to the premiere. (If they get asked at all, they get shunted sideways to the "overflow room" down the street, far away from the red carpet.) It's especially galling when they're doing a film with "legitimate celebrities": often they record just as many lines, and often their characters get more screentime, but the celebrity who does a cameo for 2 minutes of the film gets to walk the carpet and attend the premiere, while the voice actor with a much bigger part in the project gets to hang out in the overflow room with the accountant's intern and the localisation coordinator's mother-in-law.

But that's also why they get cast, right? It probably cost the producer 10x as much to book that celebrity to read 6 lines as it did to book that anonymous voice actor to spend three weeks in a recording studio. Producers keep them anonymous because anonymous is cheap, and anonymous is replaceable: over the course of an eleven-film series, you can't recast live-action Dumbledore without people noticing -- but you can recast animated Scooby Doo six times in a single TV season and nobody but the most obsessive fans will care.

Sometimes they still make a name for themselves: Rob Paulsen's a rising celebrity, albiet quite late in his career. Sometimes, like Mary Birdsong (who's done some voice acting for Drag Race!), they can establish themselves as theatre performers in addition to voice actors, which makes them more visible.

But for the most part, they're anonymous. In many cases they don't even get credit. (If you do an animated show, you probably get a credit for episodes in which you voiced a named character or made a big contribution -- "Various Voices", "Background", etc. -- but for something like Drag Race, where you're basically recording a jingle, you're lucky to get much of anything.)