CREATE TABLE table_31443 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Viewers  ( million ) " TEXT)

Who directed the episdoe veiwed by 3.24 million viewers?
SELECT "Directed by" FROM table_31443 WHERE "Viewers (million)" = '3.24'
SELECT "Directed by" FROM "table_31443" WHERE "Viewers (million)" = '3.24'