Certainly, the most famous Halloween-centric broadcast of the legendary Orson Welles (shown here in dapper and shockingly young form) is the much mythologized War of the Worlds show that, if one believes, was responsible for widespread panic throughout the Tri-state area.
When The Mercury Theater (full title: The Mercury Theater on the Air) debuted in 1939, Dracula was their first broadcast. Welles himself provided the voices of the eponymous vampire and Doctor Seward. Theater regular Agnes Moorehead plays Mina and the great Bernard Herrmann provides the score. But why stay here reading my blah blah blah? Click on over and enjoy!