How many million u.s. viewers saw the episode that was directed by roger young and written by debra j. fisher?
CREATE TABLE "table1_28037619_2" (
  "no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real,
  "u_s_viewers_million" text
);
SELECT "u_s_viewers_million" FROM "table1_28037619_2" WHERE "directed_by"='Roger Young' AND "written_by"='Debra J. Fisher';