CREATE TABLE table_13336122_7 (original_air_date VARCHAR2, us_viewers__million_ VARCHAR2)

How many episodes were seen by 0.67 million US viewers on their original air dates?
SELECT COUNT(original_air_date) FROM table_13336122_7 WHERE us_viewers__million_ = "0.67"
SELECT COUNT("original_air_date") FROM "table_13336122_7" WHERE "0.67" = "us_viewers__million_"