Courage the Cowardly Dog - Season 3 Episode 2
Courage Vs. Mecha-Courage

The science teen (or Di Lung as some call him) makes an ultra robot he calls Mecha-Courage. It takes Courages place. Muriel and Eustace cant tell the difference, and they like Mecha-Courage better. (mostly Eustace) Courage challenges Mecha-Courage to a battle in the Roman Colessium! Mecha-Courage beats Courage good, but in the end, his battery runs out and he blows up. Courage is happy to be back with Muriel.