The Shadow was a popular American radio show that aired from 1930 to 1954, featuring Lamont Cranston, a wealthy young man who used a hypnotic power to "cloud men's minds" and become invisible as he fought crime. The character originated as the mysterious, sinister narrator on the 1930 radio show Detective Story Hour before becoming the star of his own series, famously voiced by Orson Welles in the late 1930s. The show's iconic opening line was, "Who knows what evil lurks in the hearts of men? The Shadow knows!"