One of the things that I liked was how there was a small cast. Apart from Colin Baker and Nicola Bryant, there are only four other characters. Peri doesn’t really feature much in this story considering its set at her exit during The Trial of a Timelord. The story sees a mysterious figure trying to destroy the Doctor and his TARDIS. This figure puts the Doctor in a void of space where he is left with the option of destroying the TARDIS.
It’s not often that we see the Doctor in a state of self contemplation. New Who has the Doctor regularly feeling sorry for himself for the way that a companion has left him but this is the first time a Classic Doctor has felt like this. At the end of the day, if you were given this for free as a subscriber then you cant really complain. If you bought it then maybe you will feel a little short changed. Either way it was a bold story that is more of a character piece than alien invasions or something like that.