CBS Radio Mystery Theater

Suspense (radio drama) (Photo credit: Wikipedia)

The format was similar to that of classic old time radio shows like The Mysterious Traveler and The Whistler, in that the episodes were introduced by a host (E. G. Marshall) who provided pithy wisdom and commentary throughout. Unlike the hosts of those earlier programs, Marshall is fully mortal, merely someone whose heightened insight and erudition plunge the listener into the world of the macabre (in a manner similar to that of "The Man in Black" on yet another old time radio program, Suspense).

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References:

Vance, John A. "Terror on the Air!: Horror Radio in America, 1931-1952." Gothic Studies 9.2 (2007): 96.

Dunning, John. On the air: The encyclopedia of old-time radio. Oxford University Press, 1998.