What was the title of the episode viewed by 5.03 million viewers?
CREATE TABLE "table1_27987623_1" (
  "series_episode" real,
  "season_episode" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_in_million" text
);
SELECT "title" FROM "table1_27987623_1" WHERE "u_s_viewers_in_million"='5.03';