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_28019988_5 ( series__number INTEGER, production_code VARCHAR )

### Question ###
What episode number of the series had a production code of bdf409?

### Accurate SQL ###

SELECT MIN(series__number) FROM table_28019988_5 WHERE production_code = "BDF409"