A pretty unexciting filler episode which mainly serves as a set up for the story arc which culminates in the final two episodes of series 1.
The plot is that The Doctor, Rose and new companion Adam arrive on Satellite 5 in the year 200,000 where there turns out to be a sinister alien influencing the brainwashed masses. It has similar themes to The Macra Terror and its descendant Gridlock as well as other Doctor Who stories. So there is nothing feeling very original or clever about it and while nothing about it is really bad, it is not brilliantly done either.
The main interesting element is the idea of new companion Adam failing to follow the instructions The Doctor gave him and causing problems which result in him being thrown out and losing his chance to travel with The Doctor any further. I find that idea great and fresh but the rest of the episode is a little bit cheesy in design, not quite convincing enough in plot or dialogue and lacks enough fun or entertainment to lift it above an unremarkable filler.
Simon Pegg who is now a big Hollywood star and who is a fan of the show is good as you might expect but is not used to his full potential in his role as the Editor, I hope he returns to the show in a better role in the future.
This is not awful in any way but it looks rather dull and feels rather dull. It actually feels a little bit too cold like the top floor of the satellite!
An acceptable filler but nothing more than that in my opinion. My least favourite of Series 1.
6.5/10.