'Power of the Daleks' is one of the most interesting dalek stories, not just because of it being to first second doctor story, but also because of the various sub-plots within the story.
Plot: Having just regenerated, the Doctor, along with his companions Ben and Polly, arrive on Vulcan, a planet covered by mercury swamps, which has been colonised by Humans. However, the colony has been gripped by political turmoil, and an examiner sent from earth to help put down the rebels is murdered on arrival. Pretending to be the examiner, the Doctor quickly learns of the colony's problems, but soon discovers and even greater one. Lesterson, the colony's head scientist, has found a space capsule in the swamps. A capsule that contains 3 dorment Daleks!
When reactivated, the Daleks, surprising, claim to be servants of mankind. Having never met a Dalek before, the colonist beleive the Daleks. The Doctor tries to warn the heads of the colony about the Dalek threat, but it could already be too late. As the rebels move to take control, a new army of Daleks is waiting, to CONQUER AND DESTROY!
Pros: In terms of plot, this story is fantastic. You've got a new doctor, companions who don't quite know what's just happened, the Daleks at their most intelligent, and much more. The character of Lesterson is Brilliant, and the climax of episode 4 is also great.
Cons: The only con that I can see is a small continuity error. The Daleks seem to have gone back to drawing power up through the floor, wetheas in every story before or since, apart from 'The Daleks', they don't need to.
This is a wounderful dr who story, and well worth your money. Hope you'll enjoy it as much as I have.