CREATE TABLE table_30033 ("Series #" FLOAT, "Season #" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

What is the series number for the episode number 10 of the season?
SELECT "Series #" FROM table_30033 WHERE "Season #" = '10'
SELECT "Series #" FROM "table_30033" WHERE "Season #" = '10'