Question: Who is the writer of Children of Earth of "Day Four"?
SQL: SELECT "Writer" FROM "2-18863597-1" WHERE "Children of Earth" = '"Day Four"';

Question: How many viewers were there for Children of Earth of "Day One"?
SQL: SELECT "Viewers (including HD) in millions" FROM "2-18863597-1" WHERE "Children of Earth" = '"Day One"';

Question: Who was the director of Children of Earth of "Day Five"?
SQL: SELECT "Director" FROM "2-18863597-1" WHERE "Children of Earth" = '"Day Five"';

Question: Who was the director of the episode written by Russell T Davies and James Moran?
SQL: SELECT "Director" FROM "2-18863597-1" WHERE "Writer" = 'Russell T Davies and James Moran';