Mortal Engines

About the film

Contains story spoilers.

Mortal Engines turns a familiar political metaphor into a physical landscape. A city can literally pursue another settlement, take what it contains and continue travelling in search of the next one. That premise makes consumption visible as both machinery and a way of thinking. People inside the larger city can understand expansion as ordinary survival, while people outside it experience the same movement as an approaching threat. The world is therefore not explained adequately by the size of its vehicles. It depends on the stories their inhabitants tell about why moving forward should require somebody else's home and future to disappear.

Christian Rivers directs the 2018 adaptation of Philip Reeve's novel, with a screenplay by Fran Walsh, Philippa Boyens and Peter Jackson. Hera Hilmar plays Hester, Robert Sheehan plays Tom, Hugo Weaving plays Valentine and Jihae plays Anna Fang. The post-apocalyptic setting combines remnants of earlier technology with a society that has organised itself around mobile cities. That relationship to the past matters because recovered objects can acquire uses their discoverers do not fully understand. The adventure is built around competing responses to inheritance: studying what remains, using it for power or recognising that something capable of surviving a catastrophe may also help repeat one.

Hester tries to kill Valentine for her mother's murder. Tom intervenes, then is expelled from London after learning the accusation. Travelling together, they discover Valentine's revived MEDUSA weapon and join resistance to his attack on the Shield Wall. Hester disables the weapon while Tom helps stop London's collision course. Valentine reveals he is Hester's father before dying, and the surviving Londoners make peace with the communities they threatened. Hester and Tom depart together. The resolution stops the immediate machinery of destruction and opens a relationship between populations previously organised as pursuers and potential prey.

Tom's displacement changes what his knowledge can explain. Inside London, a historical object can belong to an orderly account maintained by institutions. Outside it, that same account may be contradicted by people who have paid for the institution's actions. His encounter with Hester is useful because she possesses a history that cannot be treated as a neutral addition to a museum collection. It concerns a person he has respected and a harm that respect has obscured. The journey consequently makes learning uncomfortable. Acquiring more information requires revising the position from which earlier information appeared trustworthy, rather than simply adding another interesting fact to it.

Hester's pursuit of Valentine gives the larger conflict a personal route, but revenge cannot remain separate from the world his power affects. A private grievance brings her close to a threat whose consequences extend far beyond the original loss. That widening makes her alliance with Tom more than an interruption to her goal. Other people's lives become part of what responding to the past now requires. The film can understand her anger without allowing anger to define every future relationship. The possibility of travelling together introduces something different from pursuit: a direction chosen with another person rather than dictated entirely by the person who caused the injury.

Valentine's use of the old weapon exposes the contradiction within a civilisation claiming to have survived an earlier destruction. Survival has not necessarily produced a refusal to repeat the destructive logic. An inherited capability can become attractive precisely because it offers an apparent shortcut around present limits. That makes the technological threat inseparable from ambition. The device does not decide where the city should go or which people should be sacrificed to its movement. Those decisions belong to someone willing to treat the past's dangerous power as an opportunity. The fantasy's machinery makes that willingness visible on a scale that ordinary political rhetoric could more easily conceal.

The stationary communities offer an alternative to the assumption that continued movement must mean continued acquisition. Their existence is important because it prevents London's arrangement from appearing inevitable simply because its inhabitants know no other one. A system can be familiar, internally organised and still depend on harming people beyond its boundary. Encountering an alternative changes the argument from a choice between predation and extinction to a question about how different communities might live. The film's conflict does not require the alternative to have every problem solved. It requires it to remain real enough to challenge the claim that there is only one possible route through the world's scarcity.

The peace at the end supplies a more consequential change than defeating Valentine alone. A leader can disappear while the habits supporting him remain, so the relationship between the surviving populations matters to whether the victory has a future. Hester and Tom's departure gives their own relationship room beyond its original circumstances, while the halted city must find a way to exist without treating others as resources. Mortal Engines uses its immense moving settlements to make consumption impossible to overlook. Its adventure becomes clearest through the people who learn to question that movement, and through the possibility that survival might begin to mean stopping before another community is destroyed.