CREATE TABLE table_17489 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many U.S Viewers, in millions, were for series # 26?
SELECT "U.S. viewers (millions)" FROM table_17489 WHERE "Series #" = '26'
SELECT "U.S. viewers (millions)" FROM "table_17489" WHERE "Series #" = '26'