The Doctor and Sarah are staying at the home of Rector Adams, who has rescued the Doctor from near-drowning. The rector has received an invitation to Lady Huntingdon's ball and invites the Doctor and Sarah to accompany him. The Doctor isn't interested and leaves for the TARDIS with Sarah. However, on the way, he discovers a double-decker bus in the woods and decides to attend the ball after all. The Doctor and Iris are attacked in her TARDIS by some large creature. They scare it away with some flares. Turner drives Sarah home, but en route they find the mauled body of the rector.