Children of Earth is the banner title of the third and penultimate series of the British television science fiction programme Torchwood, which broadcast for five episodes on BBC One from 6 to 10 July 2009. The series had new producer Peter Bennett and was directed by Euros Lyn, who had considerable experience on the revived Doctor Who, Torchwood's parent show. The eponymous series is about an organization known as Torchwood which defends the Earth against alien threats. The plot of Children of Earth deals with aliens demanding 10% of the Earth's children, and a related earlier conspiracy 40 years ago; as such, Torchwood is pitted against the British government when the government attempts to conceal its past actions and accede to the present-day aliens' demands. The first, third, and fifth episodes of the serial were written by executive producer Russell T Davies, who also conceived its overall storyline. The third episode was co-written by James Moran whilst the second and fourth were penned by newcomer John Fay.

Torchwood is a British science fiction television programme created by Russell T Davies. A spin-off of the 2005 revival of Doctor Who, it aired from 2006 to 2011. The show shifted its broadcast channel each series to reflect its growing audience, moving from BBC Three to BBC Two to BBC One, and acquiring American financing in its fourth series when it became a co-production of BBC One and Starz. Torchwood is aimed at adults and older teenagers, in contrast to Doctor Who's target audience of both adults and children. As well as science fiction, the show explores a number of themes, including existentialism, LGBTQ+ sexuality, and human corruptibility.