CREATE TABLE table_22529 ("Series #" CLOB, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Prod. code" FLOAT)

Who wrote the episode originally aired on September 29, 1999?
SELECT "Written by" FROM table_22529 WHERE "Original air date" = 'September 29, 1999'
SELECT "Written by" FROM "table_22529" WHERE "Original air date" = 'September 29, 1999'