CREATE TABLE table_25127 ("Series #" FLOAT, "Season #" FLOAT, "Episode title" CLOB, "Written by" CLOB, "Directed by" CLOB, "U.S. viewers  ( millions ) " CLOB, "Original air date" CLOB)

Who is the written by when mark worthington is the director?
SELECT "Written by" FROM table_25127 WHERE "Directed by" = 'Mark Worthington'
SELECT "Written by" FROM "table_25127" WHERE "Directed by" = 'Mark Worthington'