What villain of the Victorian penny was played by George Dibdin Pitt?
George Dibdin Pitt:  He was the first playwright to dramatize the fictional character Sweeney Todd, in his 1847 play "The String of Pearls; or, The Fiend of Fleet Street". Sweeney Todd: Sweeney Todd is a fictional character who first appeared as the villain of the Victorian penny dreadful "The String of Pearls" (1846–47).
Sweeney Todd