Premise: The Borrowers is a Hallmark Hall of Fame TV special first broadcast in 1973 on NBC. This made for television special is adapted from the 1952 Carnegie Medal-winning first novel of author Mary Norton's "The Borrowers" series: "The Borrowers". The film stars Eddie Albert, Tammy Grimes and Judith Anderson and was directed by Walter C. Miller.
Hypothesis: Hallmark and NBC had a special agreement only for the Borrowers.