CREATE TABLE table_28768925_1 (original_air_date VARCHAR, us_viewers__million_ VARCHAR)

What date did the episode that had 8.84 million u.s. viewers originally air?
SELECT original_air_date FROM table_28768925_1 WHERE us_viewers__million_ = "8.84"
SELECT "original_air_date" FROM "table_28768925_1" WHERE "8.84" = "us_viewers__million_"