This may be a commercial for Jell-O, but it was created by the Disney Company. It features the title character from "Alice In Wonderland" with two characters from the original book but not from the animated movie adapted by Disney - the Mock Turtle and the Gryphon.
Alice is voiced by the same actress who did the honors in the movie (Kathryn Beaumont) and the presence of Sterling Holloway as the narrator suggests that he could be actually in the scene as the invisible Cheshire Cat, acting in a serlinguistic capacity. Therefore, the Tooniverse could lay claim to the cartoon movie version of 'Alice In Wonderland'. (Although it already has at least one version of the story already.)
Mark Evanier has more on the topic, which you can find here:
That linking system on his blog is pretty iffy, so it might not lead you directly to the post, but rather to all of the posts he did on that day. Just look around a bit, because it's worth it.