Ian Chesterton and Barbara Wright are surprised by the contradictory knowledge of one of their pupils, Susan Foreman. They visit her home address which turns out to be a junkyard and Susan’s grandfather, who only calls himself The Doctor, is not pleased to see them.

The two teachers refuse to leave and discover a police box that is bigger on the inside. The Doctor decides that they know too much and takes them on a journey through time and space.

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