CBS Radio Mystery Theater (a.k.a. Radio Mystery Theater and Mystery Theater, sometimes abbreviated as CBSRMT) was a radio drama series created by Himan Brown that was broadcast on CBS Radio Network affiliates from 1974 to 1982, and later in the early 2000s was carried by the NPR satellite feed. In repeats of the show broadcast in the early 2000s, Himan Brown replaced E.G. Marshall's original host segments.