This contains the stand-alone episode "Mission to the Unknown", as well as the 12-part "Daleks' Master Plan". Mission to the Unknown sets up the events of the larger story arc.
I completely disagree with another reader who wrote that there are no great stories in this collection. I was interested in all of them, but for me, the standouts are the stories about Doctors 1, 5, 9 and 11. The story about Doctor 5, "Tip of the Tongue" reminded me of "The Twilight Zone" in its exploration of social issues. It is just really good science fiction. With the story about The first Doctor, we get to see him in action before he had human companions. The 9th Doctor story is about a particularly important instant of time for that Doctor and an exploration in an interesting way of what makes a good companion. And the 11th Doctor story is by Neil Gaiman! What more can anyone ask for? It is funny, terrifying and it brings Amy back with several satisfying references to the show for fans.