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_20704243_3 (series__number INTEGER, directed_by VARCHAR)
### Question:
What series was directed by Mark Roskin?
### Answer:
SELECT MIN(series__number) FROM table_20704243_3 WHERE directed_by = "Mark Roskin"