CREATE TABLE table_27197 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who is the director when there is 11.21 million viewers?
SELECT "Directed by" FROM table_27197 WHERE "U.S. viewers (millions)" = '11.21'
SELECT "Directed by" FROM "table_27197" WHERE "U.S. viewers (millions)" = '11.21'