Barbara Wright and Ian Chesterton, two humble teachers during 1963, discover a genius student's grandfather, simply known as "the Doctor", and his police box time machine. Deciding that the pair knows too much about his otherworldly origins, they are whisked away on a journey through time and space.

Young Timmy starts as a window cleaner in the little company of his brother. Soon he learns that some female customers expect additional service. Young and curious as he is, he reluctantly accepts the juicy duty. However his heart belongs to Liz, who demands the highest commitment until she lets him go all the way.