CREATE TABLE table_25123 ("Series #" FLOAT, "Season #" FLOAT, "Episode title" TEXT, "Written by" TEXT, "Directed by" TEXT, "U.S. viewers  ( millions ) " TEXT, "Original air date" TEXT)

How many u.s. viewers (million) have a series # 83?
SELECT "U.S. viewers (millions)" FROM table_25123 WHERE "Series #" = '83'
SELECT "U.S. viewers (millions)" FROM "table_25123" WHERE "Series #" = '83'