A roster of Hollywood radio actors filled the various historical roles. William Conrad was one of the more frequently heard performers, in such diverse parts as Nero, Blackbeard, Pat Garrett and King Arthur. Other performers, and the villains and victims they portrayed, included Jack Kruschen (as William Burke and Trotsky assassin Ramón Mercader), Jay Novello (as William Hare and Dr. William Palmer), Mary Jane Croft (as Bathsheba Spooner and Madame de Brinvilliers), Betty Lou Gerson (as Agrippina and Lucrezia Borgia), Edgar Barrier (as Julius Caesar), Harry Bartell (as Brutus), Hans Conried (as Ali Pasha), Herb Butterfield (as Lincoln, Trotsky, and Thomas Edwin Bartlett), Jack Edwards (as John Wilkes Booth and Cole Younger), Irene Tedrow (as Lizzie Borden), William Johnstone (as Robert Knox), Betty Harford (as Madeleine Smith and Ripper victim Mary Jane Kelly), Eve McVeagh as Madame Marie Lafarge, Clayton Post (as Jesse James), and Sam Edwards (as Billy the Kid and Bob Younger).