Synopsis: Some bad guys show up, they want to destroy Earth, The Doctor must save the day. The baddies teamed up with The Master, but The Master learns he must work with The Doctor.
I did not like this episode. So much so that between watching episode 3 and 4 there was a month and a half gap. So honestly I don’t remember much of the episode.
It seems to be a repeat of much of the season. Baddie arrives, they’re allied with The Master. They try to take over the world, they turn on The Master, The Master teams up with The Doctor, and together they make things go.
There was one major development in the episode, and that is The Doctor can now leave Earth, but he will always return.