Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait. With Michelle Ryan. David's video diary from Dubai. Facts and figures from Captain Jack. How scary is the ...

The Sontaran Stratagem is the fifth story to feature the clone warriors. They have previously appeared in The Time Warrior (1973-4), The Sontaran Experiment (1975), The Invasion Of Time (1979 ...