Question: How many directors for #15?
SQL: SELECT COUNT("Directed by") FROM "1-20942925-1" WHERE "#" = 15.0;

Question: What is every director with production code of NABF13?
SQL: SELECT "Directed by" FROM "1-20942925-1" WHERE "Production code" = 'NABF13';

Question: What are all values for U.S. viewers(millions) with Kevin Curran as a writer?
SQL: SELECT "U.S. viewers (millions)" FROM "1-20942925-1" WHERE "Written by" = 'Kevin Curran';

Question: How many titles for the production code of NABF07?
SQL: SELECT COUNT("Title") FROM "1-20942925-1" WHERE "Production code" = 'NABF07';