Mutual tried it's hand at radio drama several times.
In the 1940s and 50s "Family Theater" was aired and was a rather popular award winning show. Radio Maria USA still airs its repeats on Sunday afternoons. Father Patrick Peyton was the program's founder and originated the phrase: "The family that prays together stays together."
http://www.familytheater.org http://www.radiomaria.us
Also "Zero Hour", a half hour nightly program hosted by Rod Serling aired in 1973 until his passing in 1974.
http://members.aol.com/radiodrama/zerohour.html
Family Theater actually lasted in re runs until the early 60s. Mutual was also the home of The Shadow from 1938-1954
It later inspired "CBS Radio MysteryTheater" afterward in that decade."
http://home.twcny.rr.com/myafchak/