The Fourth 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.

At the ball, the Doctor sees Iris Wildthyme and talks with her while Sarah dances with a young man named Turner. Turner’s conversation leads Sarah to suspect he is not from this time…