Broadcast: Sunday 7th December 2014
3:30am-4:30am AEDT (16:30 GMT) < > « »
(actually broadcast at 03:33:00)
SyFy (Australia) (adverts during broadcast)

Featuring: Matt Smith, Arthur Darvill, Karen Gillan, Elizabeth Berrington, Suranne Jones, Adrian Schiller, Michael Sheen

The Doctor follows a Time Lord distress signal to a mysterious asteroid in a Bubble Universe - could there really be another living Time Lord out there? But the asteroid hides a secret which could threaten the existence not only of the TARDIS crew, but of the TARDIS itself.
Synopsis Source: Syfy Site Listing