CREATE TABLE "season_2" (
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);

Question: What is the title of the episode with a production code of ad1b04?
SQL: SELECT "title" FROM "season_2" WHERE "production_code"='ad1b04';