This is worth a listen even though it will take some effort to stick with. Younger Doctor Who fans might not be too interested but if they can appreciate a good story from when the concept of Doctor Who was still new, they should give this a try.
The story revolves around the Daleks making a deal with, basically a high level politician, to obtain an element to conquer the galaxy. What makes this so memorable is how tragic a story it is. If there is one story that brings home the damage the Daleks are capable of, and the lasting terror they inflict on the Doctors to follow the First this is the one.
This story follows The Myth Makers and precedes The Massacre of St Bartholomew's Eve. This is a very good period of Doctor Whom in terms of the scripts. I feel the writers really got a grasp of what this Series is about by this 3rd season.