CREATE TABLE table_30383 ("\\u2116" FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Who wrote episode number 18?
SELECT "Written by" FROM table_30383 WHERE "#" = '18'
SELECT "Written by" FROM "table_30383" WHERE "#" = '18'