How many million u.s. viewers saw the episode that was directed by roger young and written by debra j. fisher?
create table table_28037619_2 (us_viewers__million_ varchar, directed_by varchar, written_by varchar, PRIMARY KEY (us_viewers__million_))
select us_viewers__million_ from table_28037619_2 where directed_by = "roger young" and written_by = "debra j. fisher"