CREATE TABLE table_3771 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

What was the original air date of the episode that was directed by Alex Zakrzewski?
SELECT "Original air date" FROM table_3771 WHERE "Directed by" = 'Alex Zakrzewski'
SELECT "Original air date" FROM "table_3771" WHERE "Directed by" = 'Alex Zakrzewski'