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_58198 ( "Character" text, "Portrayed by" text, "Crime" text, "First appearance" text, "Last appearance" text )

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

### Accurate SQL ###

SELECT "First appearance" FROM table_58198 WHERE "Portrayed by" = 'chad williams'