Evil con Carne (2001) - Cartoon Network.
"Evil con carne" started as "Grim and Evil", where it shared the air time with Billy & Mandy for the first season of both shows. Then Cartoon Network decided to separate both shows into two separated shows that we now know as "Evil con Carne" and "Billy and Mandy"
Then Maxwell Atoms had to choose what show to continue. He choosed Billy and Mandy and thus Evil con Carne was cancelled after a short 2nd season.