CREATE TABLE table_11655 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT)

Who wrote series number 99?
SELECT "Written by" FROM table_11655 WHERE "Series #" = '99'
SELECT "Written by" FROM "table_11655" WHERE "Series #" = '99'