CREATE TABLE table_17393 ("No. in series" TEXT, "No. in season" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

Who directed the episode with a production code 3ADK-03?
SELECT "Directed by" FROM table_17393 WHERE "Production code" = '3ADK-03'
SELECT "Directed by" FROM "table_17393" WHERE "Production code" = '3ADK-03'