After last night's transmission of the third episode of Torchwood series three, a next time trailer for the fourth episode was shown. The next time trailer has an approximate running time of thirty five seconds and it features many new clips that haven't previously been seen before. It can be viewed here but please be aware that it contains spoilers for those who are yet to see the first two parts of Children of Earth. The BBC are also currently airing a different trailer for the episode on their channels and you can view that trailer here. It is approximately nineteen seconds long and again, please note that it contains spoilers if you haven't yet watched the first two episodes of the series. Day Four, the fourth episode of Torchwood's third series, will premiere in the United Kingdom tonight at 9pm on BBC One. It will then air in Australia tomorrow and it's set for transmission in America and Canada on the twenty third of July following the series premiere on the twentieth of July. What do you think of these two trailers for Day Four?