Question: How many viewers, in millions, were for the episode directed by Tawnia McKiernan?
SQL: SELECT "U.S. viewers (millions)" FROM "1-12159115-3" WHERE "Directed by" = 'Tawnia McKiernan';

Question: How many episodes were written only by William N. Fordes?
SQL: SELECT COUNT("Series #") FROM "1-12159115-3" WHERE "Written by" = 'William N. Fordes';

Question: How many U.S Viewers, in millions, were for series # 26?
SQL: SELECT "U.S. viewers (millions)" FROM "1-12159115-3" WHERE "Series #" = 26.0;