BRIGADIER: And you came back of your own accord?
DOCTOR: Well, I...
JO: Doctor?
DOCTOR: No. No, I’m afraid not. No, obviously the Time Lords have programmed the TARDIS always to return to Earth. It seems that I’m some kind of a galactic yo-yo!

Aww, he doesn't admit that he cares about them. Also I really loved the dynamic between The Doctor and The Master in episode 4. Some really cute Thoschei moments here.

Those Axon flesh monsters would have given me nightmares if I had seen this as a child. Overall I think this was a good story.