CREATE TABLE table_name_53 (series__number INT, original_air_date VARCHAR)

Tell me the highest series # for september 22, 1976
SELECT MAX(series__number) FROM table_name_53 WHERE original_air_date = "september 22, 1976"
SELECT MAX("series__number") FROM "table_name_53" WHERE "original_air_date" = "september 22, 1976"