4/6 Lesterson is driven insane when he discovers that the Daleks are reproducing themselves...
3/6 Polly is a prisoner of the rebels who want to use Daleks to take control of the colony.
2/6 Posing as an Examiner from Earth, the Doctor tries to warn Lesterson about the Daleks.
1/6 Ben and Polly suspect the 'new' Doctor may be an imposter. The TARDIS lands on Vulcan.