Torchwood's Julie Gardner has admitted that the show's future is uncertain.

The executive producer told Assignment X that only "time will tell" if the sci-fi drama returns to Starz and BBC One.

"I don't know if there will be more," she said. "The thing about there being more or not - you look at Torchwood, and it's always had such a labyrinthine history.

"For this new season, Torchwood has been off the air for two years in the UK. The weird thing is there are some series where that would really matter. It would be a real problem. I think Torchwood is so elastic in some ways and has had such a strange peculiar life."

Gardner went on to suggest that "all options are possible" with regards to the show's future.

"It... has been across so many different channels and so many international audiences, across so many different story structures, and so many numbers of episodes," she explained. "There's no single way forward for the show."

Starz CEO Chris Albrecht first indicated that Torchwood might not return for another season in August.

"Torchwood is not one of the shows we went into thinking about a yearly return," he said. "It's about [series creator] Russell T Davies [because] he has a lot of things on his plate."

> Torchwood: Miracle Day: Success or Failure?

Watch Julie Gardner and Russell T Davies discuss Torchwood: Miracle Day with Digital Spy below:

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