CREATE TABLE "table1_13336122_7" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);

Question: When did the episode "Hell bent for leather" originally air?
SQL: SELECT "original_air_date" FROM "table1_13336122_7" WHERE "title"='\"Hell Bent for Leather\"';

Question: What's the season number of the episode titled "Quitters"?
SQL: SELECT MIN("no_in_season") FROM "table1_13336122_7" WHERE "title"='\"Quitters\"';

Question: What's the season number of the episode watched by 0.57 million US viewers?
SQL: SELECT MAX("no_in_season") FROM "table1_13336122_7" WHERE "u_s_viewers_million"='0.57';

Question: How many episodes were seen by 0.67 million US viewers on their original air dates?
SQL: SELECT COUNT("original_air_date") FROM "table1_13336122_7" WHERE "u_s_viewers_million"='0.67';

Question: What episode was directed by David Duchovny?
SQL: SELECT "title" FROM "table1_13336122_7" WHERE "directed_by"='David Duchovny';