Torchwood: Children of Earth: Day Four

"Children of Earth: Day Four" is the fourth episode of series three of the BBC Wales science fiction television series Torchwood and the thirtieth episode of the series overall. It is the fourth chapter in the "Children of Earth" storyline, which comprised all of series three. The episode was directed by Euros Lyn with a teleplay written by John Fay. It first aired on BBC One in the United Kingdom on Thursday, July 9th, 2009. It first aired on BBC America in the United States on Thursday July 23rd, 2009.