After a botched experiment with mixing DNA from Adolf Hitler’s cryogenically frozen testicles (from his sex change), and the fetus of a bear, the scientists unintentionally created two nearly-perfect Imp clones of the Furor. Unfortunately, the Imps immediately killed the scientists after inception.
Once captured, scientists put the Imps through a series of psychological experiments, including branding the word “Good” on their evil little faces.
Later that same year, the Imps created Marmite, a mixture of varmints and bear scat, as they had grown weary of Vegemite. Nazi scientists were overwhelmed at the positive psychological effect the Marmite had on the Imps, and started a world-wide sales pitch that eventually drove the wicked testicly-cloned Imps to good.