CREATE TABLE table_72603 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

Which episode number drew in 3.84 million viewers in the U.S.?
SELECT MAX("Series #") FROM table_72603 WHERE "U.S. viewers (million)" = '3.84'
SELECT MAX("Series #") FROM "table_72603" WHERE "U.S. viewers (million)" = '3.84'