The recurring villain and Danger Mouse's archenemy; a toad with a wheezy voice, although, sometimes, he was referred to as a frog. Known as Baron Greenteeth in the unbroadcast pilot episode. Commonly known as the "Terrible Toad". In America, "Greenback" is slang for dollar bill in many regions, adding to the sense of his commercial greed. Allegedly, he turned to a life of crime as a schoolboy when other children stole his bicycle and let all the air out of its tyres. In the 2015 revival series, the character was renamed Baron Silas von Greenback, and was given a German accent.