The Doctor goes to the planet Marinus. Here, the Daleks are at war with the Voord. He watches the battle collapse after the two sides agree to go to Earth to locate a mysterious power source. The new allies capture the Doctor and force him to divulge the secret of Ultkron travel or how to travel through time. En route to the Solar system, the Doctor unsuccessfully attempts to sabotage the Voord ship. The Voord eject him into the vacuum of space, but the Daleks use their hoverbouts to rescue him. They secret him to their part of the Voord ship.