63. The Mutants

While season 8 saw the Doctor leave Earth once, this season sees the Doctor and Jo leave twice, bouncing between Earthbound and space adventures. The previous trip to Peladon was a classic, this time is not so classic. The Mutants monsters themselves are quite good and make a reappearance or two in the future. But this story is again too long, with 6 episodes that could be 4. The dying imperialism of Earth is interesting with power hungry people running amok. The eventual point of the story of a races ultimate evolution is a nice twist on the Daleks origin. All in all, another lack luster mission for the Time Lords.

http://en.wikipedia.org/wiki/The_Mutants