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_25668962_1 (us_viewers__million_ VARCHAR, no_in_series VARCHAR)

### Question ###
How many million U.S. viewers watched episode number 6 in the series?

### Accurate SQL ###

SELECT us_viewers__million_ FROM table_25668962_1 WHERE no_in_series = 6