Table schema:
CREATE TABLE table_28511558_2 (original_air_date__us_ VARCHAR, directed_by VARCHAR, written_by VARCHAR)

Question: What date did the episode directed by Victor Cook and Written by Brat Jennett air in the U.S.?
SQL: SELECT original_air_date__us_ FROM table_28511558_2 WHERE directed_by = "Victor Cook" AND written_by = "Brat Jennett"