An episode of the American radio drama anthology series The Mercury Theatre on the Air directed and narrated by actor and future filmmaker Orson Welles as an adaptation of H. G. Wells's novel The War of the Worlds (1898). It was performed and broadcast live as a Halloween episode at 8 p.m. on Sunday, October 30, 1938, over the Columbia Broadcasting System radio network. The episode became famous for allegedly causing panic among its listening audience, though the scale of that panic is disputed, as the program had relatively few listeners.