I don't know about THE BRAVE LITTLE TOASTER having an "all-star" voice cast... it was most comprised of obscure comedic actors, with Jon Lovitz and Thurl Ravenscroft probably being the more well-known of the cast (and Lovitz didn't even reprise Radio's voice in the two VHS sequels).
Thurl Ravenscroft was the original voice of Tony the Tiger in Kellogg's Frosted Flakes commercials, and he sang "You're A Mean One, Mr. Grinch" in the classic
How The Grinch Stole Christmas TV special.
He has also worked as a background singer for numerous Disney animated features, such as the elder voice of progress in
Donald and the Wheel,
back when the studios had been known for its informative side with such short "educational features" as
Donald in Mathmagic Land,
and short subjects such as
Freewayphobia and
Goofy's Freeway Troubles featuring the "new Goofy" which were produced with the apparent intentions of informing future drivers about highway safety, different driving personalities, etc.,
in the hopes that some future drivers would make wiser choices in regards to an era when cars were looking more sporty and appealing....