Question: The 1985 film "Return to Oz" is loosely based on which of L. Frank Baum's books?
Sentence (from "Return to Oz"): It stars Nicol Williamson as the Nome King, Jean Marsh as Princess Mombi, Piper Laurie as Aunt Em, Matt Clark as Uncle Henry and introduces Fairuza Balk as Dorothy Gale.
Relevant evidence: No