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_name_26 ( first_appearance VARCHAR, portrayed_by VARCHAR )

### Question ###
What is the name of the first appearance when Chad Williams is a portrayal?

### Accurate SQL ###

SELECT first_appearance FROM table_name_26 WHERE portrayed_by = "chad williams"