What is the name of the first appearance when Chad Williams is a portrayal?
CREATE TABLE table_58198 (
    "Character" text,
    "Portrayed by" text,
    "Crime" text,
    "First appearance" text,
    "Last appearance" text
)
SELECT "First appearance" FROM table_58198 WHERE "Portrayed by" = 'chad williams'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the name of the first appearance when Chad Williams is a portrayal? ### Input: CREATE TABLE table_58198 (
    "Character" text,
    "Portrayed by" text,
    "Crime" text,
    "First appearance" text,
    "Last appearance" text
) ### Response: SELECT "First appearance" FROM table_58198 WHERE "Portrayed by" = 'chad williams'