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Rob (Dick Van Dyke) plans to devote an episode of "The Alan Brady Show" to a showcase of famous old radio comedians. The staff has no trouble lining up such venerable talent as Bert Gordon (the "Mad Russian" of The Eddie Cantor Show fame) and Arlene Harris (whose "Chatterbox" routines were a highlight of Al Pierce and His Gang). But when Rob approaches Edwin Carp (Richard Haydn), the tweedy "Fish Man" of many a classic radio variety series, Carp refuses to emerge from retirement -- and for a very strange reason.