act just as the diary has said he will, or else people will die. Richard and Emily are forced back into the arena, where they are pitted against an intelligent hunter. Emily provides a distraction while Richard tracks and kills their opponent—which turns out to be mechanical as well. As another, larger killer enters the arena, Richard finally deduces the purpose of the tests; they are being assessed as suitable targets for the hunters in the safari park. Meanwhile, the sailors catapult their explosive fungus at the citadel until two saucer probes arrive to investigate, and the Phiadorans capture them, enabling the Doctor to deactivate the remote controls and rewire them so the British can fly them manually. Turlough leads the flight to what appears to be a greenhouse dome, where, just as he has read in the diary, he crashes through the glass dome and crushes the robot hunter, saving Richard and Emily's lives. The sailors then fight their way to the warden, and the TARDIS’ influence enables the Doctor to speak with it. The warden is as much a prisoner as the others, having been genetically and mentally conditioned to keep the park running properly. It is unable to disobey orders directly, but it is weary of its long servitude, and therefore shows the Doctor which computer banks control the robots. The British sailors destroy them, and as the robots shut down, the warden allows itself to die as well, its task finally complete. The Doctor releases the energy fields, enabling the British to depart, but notices that the warden's death has triggered an automatic shut-down procedure. The park has been programmed to self-destruct, leaving no trace of its existence, and the atmospheric shields are already decaying. The sailors retreat on the saucers, taking the Phiadorans with them—but the citadel's plasma cannon begins firing on an automatic setting, and the Doctor, Turlough and Lytalia are shot down near the Draco. The presence of bodies with bullet wounds indicate what has happened here, but as the crater's atmosphere is already beginning to dissipate into space, they have no choice but to contact the mutineers and board the ship. Stanton orders the Doctor and Turlough to help repair the damaged impeller coils, and they have no choice but to obey, although they are under no illusion that they will be allowed to live should they succeed. In fact, Stanton intends