Crikey! I had no idea it existed! But, apparently, it does. And here's its intro.
Not quite sure about the animation quality, but a giant CG A'Tuin is always welcome.
(One quibble: A'Tuin is not a he, unless space turtle physiology is far stranger than the whole "elephants and discs" thing.)
Edit: apparently this episode (the "Reaper Man" adaptation) was never produced. Shame, that, although they did do Soul Music and Wyrd Sisters.