CREATE TABLE table_30812 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

Who directed the episode that aired November 21, 2003?
SELECT "Directed by" FROM table_30812 WHERE "Original air date" = 'November 21, 2003'
SELECT "Directed by" FROM "table_30812" WHERE "Original air date" = 'November 21, 2003'