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Last broadcast on Mon, 8 Jun 2009, 19:00 on BBC Three (see all broadcasts).
Synopsis
Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait.

Credits
- The Doctor
- David Tennant
- Donna Noble
- Catherine Tate
- Martha Jones
- Freema Agyeman
- Wilfred Mott
- Bernard Cribbins
- Sylvia Noble
- Jacqueline King
- Luke Rattigan
- Ryan Sampson
- Colonel Mace
- Rupert Evans
- General Staal
- Christopher Ryan
- Commander Skorr
- Dan Starkey
- Ross Jenkins
- Christian Cooke
- Producer
- Douglas Mackinnon
- Producer
- Susie Liggat