Mister Rogers and his saxophonist friend, Eric Kloss, visits a cave with Betty Aberlin as tour guide. This cave has its own organ, on which Rogers accompanies Kloss's sax. Events accelerate at the Neighborhood of Make-Believe, as King Friday has arranged for ""Sir Thomas T. Tune"" to be Prince Tuesday's new tutor. X the Owl's Cousin Mary arrives with a new Owl Correspondence School lesson.
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