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For thousands of years the Sontarans and the Rutans have fought a brutal war across the galaxy. Now the Sontarans have a secret plan to destroy the Rutan race - a secret plan the Doctor is racing against time to uncover.

Only one Rutan spy knows the Sontarans’ plan. As he is chased through the galaxy in a desperate bid for his life, he reaches the planet Sentarion - where Professor Bernice Summerfield’s research into the history of the Sontaran-Rutan war is turning into an explosive reality...

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