I finally managed to watch it all the way through, and let me tell you it is rubbish! Total rubbish! The whole thing doesn't seem to make a whole lot of sense. Come to think of it, I'm not entirely sure what even the title refers to. I kind of understand the 'engines', but what is the 'mortal' supposed to refer to. I suppose they had to come up with some name and "Mortal engines" sounds cooler than "Choo-choo cities". Anyways, like I said, the whole plot doesn't make any sense. We follow the city of London and it's inhabitants as the city is seen rolling around the world in wheels. The whole city is some kind of a gigantic scavenger that eats smaller cities and takes their resources. Now, here is the first problem. They also seem to take in all the citizens from those other cities they have "eaten" or scavenged. So what you end up is a one time boost to your resources, but also end up with a whole bunch of new mouths to feed, and you will have to feed those mouths for the rest of their lives. How exactly would this be useful to London in any way? The new citizens would end up consuming way more than the city benefits from their one time plundering of their resources. It's not the only problem either. There apparently still are "static" cities. Now the villain of the movie Hugo Weaving has had enough of small fry and decides it's time to go after a big score in the form of a static city called "Shan quo", which is somekind of a Chinese Wakanda, that is more open to strangers than their african counterpart. Old Hugo decides to assault the city and builds some kind of doomsday weapon. Thing is though, the Wakan.....excuse me Shan quoans seem to be very hospitable and welcoming so I'm not sure why they didn't save themselves and especially the moviegoers the trouble, and just drive over there and say "Let us in, bros". End movie. The whole movie would've lasted about five minutes.

If it wasn't bad enough as it is, you got a whole bunch of characters, each more meaningless and boring than the other, and you end up giving absolutely crap about any of them. You have quite dramatic death sequences of robots and Shan quo pilots and other people, and you just can't help but to think "Who cares. Good riddance". Also a whole bunch of stupid scenes and technology like the flying sailship with wooden floors and canvas walls that otherwise has the characteristics of a fighter jet, and flies in supersonic speed and is able to make tight turns all the while the pilot of that plane/ship is just leisurely standing in front of the controls unsecured. I suppose their technology nullifies G-forces among other things.