The Doctor, Tegan and Turlough arrive in the quaint village of Heatherington in 1951. So why can Tegan see it, and how is she going to fix it?. As Tegan takes off to reconnect with an old friend, and the Doctor teams up with young activist Zan, Turlough is pulled into the heart of Luqos by the shadowy 'M', where they discover an old enemy at work beneath the city.
