Ask I remember about it was one caricature sold their soul to beazulbub to save the other one. Maybe it was on hbo.it was around the same time as animalympics. And had the same look as rock and rule?

Try,.

The Devil and Daniel Mouse

It was a short special made by Nelvana animation. Rock and Rule is basically a feature length movie based on the special and it's included as an extra on the 2nd DVD of Rock and Rule