Cult
The third series, Torchwood: Children Of Earth, will air over five consecutive nights on BBC One this Spring.
The trailer will be shown at 4pm ET on Thursday at New York ComicCon 2009, where star Eve Myles and director Euros Lyn are due to participate in a panel session.
At the same time - 9pm GMT - the preview will be made available on the Torchwood website at bbc.co.uk/torchwood.
Series producer Peter Bennett previously told Digital Spy that Children Of Earth would be an "epic" tale, with a "dilemma about a subject that's going to affect all the children of Earth".
> Preview: Torchwood series three
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