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_25668962_1 (directed_by VARCHAR, no_in_series VARCHAR)
### Question:
Who directed episode number 18 in the series?
### Answer:
SELECT directed_by FROM table_25668962_1 WHERE no_in_series = 18