The science teen (or Di Lung as some call him) makes an ultra robot he calls Mecha-Courage. It takes Courage's place. Muriel and Eustace can't 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.