CREATE TABLE "table1_11820086_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_millions" text
);

Question: What was the series number for the episode "I Forgot to Remember to Forget"?
SQL: SELECT MIN("no_in_series") FROM "table1_11820086_1" WHERE "title"='\"I Forgot to Remember to Forget\"';

Question: Who directed the episode that was viewed by 2.57 million people in the U.S.?
SQL: SELECT "directed_by" FROM "table1_11820086_1" WHERE "u_s_viewers_millions"='2.57';

Question: Who directed the episode that was viewed by 2.50 million people in the U.S.?
SQL: SELECT "directed_by" FROM "table1_11820086_1" WHERE "u_s_viewers_millions"='2.50';

Question: Which episode number in season 5 was viewed by 3.00 million U.S. viziers?
SQL: SELECT MIN("no_in_season") FROM "table1_11820086_1" WHERE "u_s_viewers_millions"='3.00';