Ian is dreaming of a car crash, with Barbara as the victim. When he wakes up, he finds himself in the TARDIS, which has materialised at an angle near the bottom of a ravine. The Doctor, Ian, Barbara and Vicki are all right except for minor injuries. The readings suggest they are on Earth. Ian climbs out of the TARDIS, and guides a slender tree trunk through the door of the TARDIS for the others to climb out. They need to right the TARDIS, but it will be difficult. The Doctor and Vicki go for help while Barbara and Ian try to move the TARDIS.