The Doctor was relaxing in the Zero Room while Nyssa was setting up the coordinates. Suddenly, the TARDIS received a Distress Signal. “Doctor, come quick!” Nyssa shouted. The Doctor rushed to see what was going on. It was a Distress Signal alerting them about a time ripple. “What is it this time?” Nyssa asked. “Something changed history. We have to go there and fix it.” The Doctor replied. “When did it happen, Doctor?” Nyssa asked.