Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_299121_2 (season VARCHAR, viewers__in_millions_ VARCHAR)

### Question ###
When did the season premiere that saw 8.4 million viewers first air?

### Accurate SQL ###

SELECT season AS premiere FROM table_299121_2 WHERE viewers__in_millions_ = "8.4"