CREATE TABLE "table1_27720737_1" (
  "series_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real,
  "u_s_viewers_million" text
);

Question: What is the original air date when the u.s. viewers in millions was 5.39?
SQL: SELECT "original_air_date" FROM "table1_27720737_1" WHERE "u_s_viewers_million"='5.39';

Question: What is the title of the series # 8?
SQL: SELECT "title" FROM "table1_27720737_1" WHERE "series_num"=8;

Question: What is the highest series # directed by ken whittingham?
SQL: SELECT MAX("series_num") FROM "table1_27720737_1" WHERE "directed_by"='Ken Whittingham';

Question: How many episodes had a production code 120?
SQL: SELECT COUNT("series_num") FROM "table1_27720737_1" WHERE "production_code"=120;