When Earth and twenty-six other planets are stolen and taken to the Medusa Cascade and the Doctor is nowhere in sight, it's up to the combined forces of UNIT, Torchwood, Sarah-Jane and Rose to fight off the thieves, who only have one thing to say to the resistance: "EX-TER-MIN-ATE!" All hell has broken loose! Humanity is threatened with global annihilation, as Davros and the New Dalek Empire prepare to detonate a bomb that will wipe out all of existence. The Tenth Doctor is helpless, and the TARDIS faces destruction. The only hope lies with the Doctor's companions — the "Children of Time" — but Dalek Caan predicts that one will die...