CREATE TABLE table_25758 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Who directed the episode that had 6.76 million U.S. viewers?
SELECT "Directed by" FROM table_25758 WHERE "U.S. viewers (millions)" = '6.76'
SELECT "Directed by" FROM "table_25758" WHERE "U.S. viewers (millions)" = '6.76'