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_57908 ( "Year" real, "Title" text, "Original channel" text, "Role" text, "Note" text )

### Question ###
what is the original channel when the note is co-star in year 2012?

### Accurate SQL ###

SELECT "Original channel" FROM table_57908 WHERE "Note" = 'co-star' AND "Year" = '2012'