CREATE TABLE table_58198 ("Character" CLOB, "Portrayed by" CLOB, "Crime" CLOB, "First appearance" CLOB, "Last appearance" CLOB)

What is the name of the first appearance when Chad Williams is a portrayal?
SELECT "First appearance" FROM table_58198 WHERE "Portrayed by" = 'chad williams'
SELECT "First appearance" FROM "table_58198" WHERE "Portrayed by" = 'chad williams'