With the pain of their loss still raw, The Doctor decides to take Nyssa and Tegan on a trip to help alleviate their sadness. However, par for the course, nothing goes quite the way he intended.

This week, Paddy and Tricia follow the TARDIS crew as they are recruited to solve the mysterious disappearance of a Concorde jet. With the discovery of a time warp at play, The Doctor must discover what is behind it and save the people from the dangers of their Time-Flight.