CREATE TABLE table_31392 ("Season" CLOB, "Season premiere" CLOB, "Season finale" CLOB, "TV season" CLOB, "Ranking" CLOB, "Viewers  ( in millions ) " CLOB)

When did the season premiere that saw 8.4 million viewers first air?
SELECT "Season premiere" FROM table_31392 WHERE "Viewers (in millions)" = '8.4'
SELECT "Season premiere" FROM "table_31392" WHERE "Viewers (in millions)" = '8.4'