What date did the episode directed by Victor Cook and Written by Brat Jennett air in the U.S.?
CREATE TABLE "table1_28511558_2" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date_u_s" text,
  "original_air_date_international" text
);
SELECT "original_air_date_u_s" FROM "table1_28511558_2" WHERE "directed_by"='Victor Cook' AND "written_by"='Brat Jennett';