Question: What episode number of the series had a production code of BDF409?
SQL: SELECT MIN("Series #") FROM "1-28019988-5" WHERE "Production code" = 'BDF409';

Question: What episode number of the season was written by Tom Garrigus and had 2.31 million u.s. viewers?
SQL: SELECT MAX("Season #") FROM "1-28019988-5" WHERE "U.S. viewers (million)" = '2.31' AND "Written by" = 'Tom Garrigus';

Question: What is the highest numbered episode in the series?
SQL: SELECT MAX("Series #") FROM "1-28019988-5";

Question: What episode number in the series had a production code of BDF405?
SQL: SELECT MIN("Series #") FROM "1-28019988-5" WHERE "Production code" = 'BDF405';