Lucifer Mongfish

Doctor Lucifer Mongfish was a frequent opponent of the Heterodyne Boys in the early days. He later reformed when, after a series of exciting adventures, his Beautiful Daughter Lucrezia married Bill Heterodyne and turned to the side of Good. He died in an attack on Castle Heterodyne.

His known living descendants are Agatha Heterodyne and Theopholous DuMedd, one grandchild from each of his two currently-known daughters.