Using Jack's repaired vortex manipulator, the Doctor, Martha, and Jack land in present-day London the day after the general election. The Master has hypnotised the world with a network of mobile phone satellites called Archangel, allowing him to be elected Prime Minister of the United Kingdom. He imprisons Martha's family on board the flying aircraft carrier the Valiant , on which he intends to televise first contact with a race he calls the Toclafane the following morning. The Doctor, Martha, and Jack fail to unmask the Master, and the Master takes the Doctor and Jack as prisoners. An invasion force of billions of Toclafane come to Earth. The Master orders them to wipe out a tenth of Earth's population. Martha escapes to the surface using Jack's vortex manipulator.