What date did Episode 2-01 (42) air?
CREATE TABLE "season_2_1938_1939" (
  "episode" text,
  "title" text,
  "writer_s" text,
  "preservation" text,
  "original_airdate" text
);
SELECT "original_airdate" FROM "season_2_1938_1939" WHERE "episode"='2-01 (42)';