CREATE TABLE "table1_13740746_1" (
  "ep_no" real,
  "title" text,
  "director" text,
  "written_by" text,
  "original_air_date" text,
  "production_no" real
);

Question: Who is the director of the episode "rain of terror" that was written by John Brown?
SQL: SELECT "director" FROM "table1_13740746_1" WHERE "written_by"='John Brown' AND "title"='\"Rain of Terror\"';

Question: What is the production number of "rain of terror"?
SQL: SELECT MIN("production_no") FROM "table1_13740746_1" WHERE "title"='\"Rain of Terror\"';

Question: Who wrote the episode called "mercury falling"?
SQL: SELECT "written_by" FROM "table1_13740746_1" WHERE "title"='\"Mercury Falling\"';