Mecha Courage (also spelled "Mecha-Courage") is a robot dog who was created by Di Lung to replace Courage and a villain in Courage the Cowardly Dog. He appeared as the main antagonist of the 2nd episode "Courage vs. Mecha-Courage" of season 3 of the series.
Di Lung did not think that Courage was a good enough dog for his owners Eustace and Muriel. So he designed Mecha Courage as the perfect pet for the elderly couple. Courage didn't like it one bit. Mecha Courage kept doing nice things to Eustace.
Courage and his robot counterpart fought in a gladiator match in the Roman Colosseum. Mecha Courage kept beating Courage up using the same weapons, only stronger and more destructive. Courage eventually won because he endured all of its attacks until he ran out the machine's batteries. He appears pinkish-pale with wheels on bottom with brownish-black ears like Courage (except for the wheels), He has a black scary dog head with a spring on bottom, scaring Courage. Di Lung made him as a robot because he thought he was not good enough and he said "you bad as dog, two times!" Because he did not see a stick, Courage sticks out his tounge with a stick poking it. We can also call that a stupid reason to build Mecha Courage.