Star Wars The Clone Wars Volume I and II
(I am referring to the cartoon in the early 2000's not the CGI tv show)
Now this show was created as an explanation of what happened between Episode II and III and unlike Episode II, this show was amazing. This show was created by Genndy Tartakovsky, mastermind behind Dexter's Lab, Powerpuff Girls and Samurai Jack. The show explored the universe of Star Wars and its unique characters. It showed the relationship between Obi-Wan and Anakin and Anakin's growth as a Jedi. The show introduces some new characters like General Grievous.
The first volume consisted of only 3-5 minute episodes but the second volume consists of episodes about 10-15 minutes in length. The animation is one of the best parts of this series. It was not CGI, but classic animation, which made it really good and that a lot of time and energy was put into this show. At the time one could also vote and create a new original character that would appear on the show. The show was fantastic and one of the best parts, especially if you saw it back then, is that it connected directly to Episode III. I would recommend seeing it, especially if you planned on doing a Star Wars Marathon before Episode VII. Seeing the show along with the movies would complete the whole story. I would give the series a 9 out of 10. It had everything you loved about Star Wars without too much of the stigma of the prequels.