Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT first_appearance FROM table_name_26 WHERE portrayed_by = "chad williams"