The long-lost and mostly forgotten 1966 animated version of Tolkein’s The Hobbit. Directed by Gene Deitch, and featuring artwork by Czech artist Adolf Born, this story behind this film is almost unbelievable. Read more here.
Deitch has also posted a fantastic article about Czech illustrator, sculptor, and animation director Jiří Trnka. Trnka was originally supposed to do artwork for Deitch’s Hobbit when it still intended as a feature-length, but the designs he did do never made it into the shortened version.