The Germ War is about a war against germs. That’s basically all you need to know. It’s a simple run-around as the Doctor and Rose realise the robots trying to remove the germ creatures are the real villains. 

Yes, it’s an average ‘misunderstood monster’ story, and I don’t have much more to say. 

It’s not very memorable though, which is probably the reason this review is so short.