Obscurity factor: 2
Before there was the big budget, live action version of the classic C. S. Lewis tale there was this animated television special. The familiar story was told by the talented Bill Melendez, the force behind the Peanuts specials and the Children's Television Workshop, producers of Sesame Street. If you were a fan of the book, for a long time, this was the only telling of it available, so many people saw, and enjoyed it. The story of Peter, Edmund, Susan and Lucy passing through a wardrobe and entering a strange land has a prominent place in our culture, and this production served as the introduction of it to a good portion of the population.
This version is available on DVD, though is currently not in print. Copies can still be found on Amazon, though. You can also find it on YouTube. The first installment of it is above, uploaded by nwl23.
Obscurity factor: 2 (remembered by many, though overshadowed by the subsequent film, on DVD, available on YouTube)