Question: Who is the director of the episode "Rain of Terror" that was written by John Brown?
SQL: SELECT "Director" FROM "1-13740746-1" 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 "1-13740746-1" WHERE "Title" = '"Rain of Terror"';

Question: Who wrote the episode called "Mercury Falling"?
SQL: SELECT "Written by" FROM "1-13740746-1" WHERE "Title" = '"Mercury Falling"';