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Russell T. Davies has promised that the new series of Torchwood will have an overriding storyline.

A fourth season of the programme was confirmed earlier this week after the BBC teamed up with US network Starz.

"It's very much the next step," Davies told The Hollywood Reporter. "It's not a new version, it's not a reboot. We're simply moving countries."

Davies added: "The show was previously a format show - monster of the week. The breakthrough was Children of Earth and that it became one long story. It's not going to be Lost and take 20 years to find out what's going on. It's going to have a most remarkable conclusion after ten episodes."

Torchwood is expected to air on Starz in the US and on the BBC in the UK next summer.