CREATE TABLE table_26565917_2 (original_air_date VARCHAR, us_viewers__millions_ VARCHAR)

when did 14.55 people watch?
SELECT original_air_date FROM table_26565917_2 WHERE us_viewers__millions_ = "14.55"
SELECT "original_air_date" FROM "table_26565917_2" WHERE "14.55" = "us_viewers__millions_"