CREATE TABLE table_26017 ("#" FLOAT, "Title" TEXT, "Original airdate" TEXT, "Timeslot" TEXT, "Viewers  ( millions ) " TEXT, "Nightly rank" FLOAT, "Weekly rank" FLOAT)

What episode premier received 0.680 million viewers?
SELECT "Original airdate" FROM table_26017 WHERE "Viewers (millions)" = '0.680'
SELECT "Original airdate" FROM "table_26017" WHERE "Viewers (millions)" = '0.680'