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_15185133_1 ( no_in_season VARCHAR, written_by VARCHAR, directed_by VARCHAR )

### Question ###
What season has an episode written by john o'bryan and directed by ethan spaulding?

### Accurate SQL ###

SELECT no_in_season FROM table_15185133_1 WHERE written_by = "John O'Bryan" AND directed_by = "Ethan Spaulding"