Frontier in Space - Episode 3

"Prison Cells in the Future" continues. Let's see... the Doctor and Jo are kidnapped from their prison cell, and just as quickly recaptured and put back in their prison cell. The Doctor is taken and interrogated, then put back in the prison cell. The Doctor is then taken out of his prison cell and gets sent to the prison on the Moon. Not a cell, as such, but still a prison. Jo is then taken from her cell by the Master. Yay, the Master! He's some sort of Earth colony government agent, pursuing the "criminal" Doctor and Jo. Good to see Delgado again, it's a horrible shame that this is his last story before his tragic fatal accident. The Moon prison is an interesting idea. Hey, it just struck me, we see absolutely no Draconians in this episode. Weird. Anyway, the Doctor attempts to escape the Moon prison and is trapped inside an airlock that is depressurizing (or something) ...