CREATE TABLE table_17476 ("Series #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Who's the writer of the episode see by 12.13 million US viewers?
SELECT "Written by" FROM table_17476 WHERE "U.S. viewers (millions)" = '12.13'
SELECT "Written by" FROM "table_17476" WHERE "U.S. viewers (millions)" = '12.13'