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_11111116_8 ( us_viewers__million_ VARCHAR, original_air_date VARCHAR )

### Question ###
How many millions of U.S. viewers watched the episode that first aired on March 31, 2013?

### Accurate SQL ###

SELECT us_viewers__million_ FROM table_11111116_8 WHERE original_air_date = "March 31, 2013"