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Tom Natsworthy is the main protagonist of the Mortal Engines Quartet. He is an apprentice Historian at the beginning of the series. After being kicked off of London by Thaddeus Valentine for chasing Hester Shaw in book one (which would lead to questions about her), he eventually has diverse adventures across the world.

In the film adaptation of book one, he is portrayed by Irish actor Robert Sheehan.


Tom Natsworthy has green eyes, brown hair, and pale skin. He wore the uniform of a Third Class apprentice in London at the start of the series. In Infernal Devices, he is described as starting to bald on the top of his head and having gained some weight with age.


Tom is shown to be fascinated with history, yet bored with his apprenticeship at the beginning of the series. He is an extremely kind hearted, peaceful, and polite person, and is upset by violence and things he perceives as unjust or cruel. This makes him a well liked person by almost every he meets and able to see the best in others, but it also makes him somewhat gullible and prone to being tricked several times in the series. Gargle notes that he looks deeper than appearances in people, a rare trait among the Drys.


Early life

Tom was born in London to Rebecca and David Natsworthy, residents of Tier Four. His parents were killed in the The Big Tilt, and he was subsequently left in the care of the Guild of Historians.

When he was twelve, he won a Guild prize for an essay on identifying fake antiquities.

Mortal Engines Quartet

Mortal Engines

By the time he was fifteen years old, Tom was a Third Class Apprentice, working under Chudleigh Pomeroy. He observed London's capture of Salthook, but was sent to the Gut after a brawl with Herbert Melliphant.

Tom was accompanied by his hero, Head Historian Thaddeus Valentine, as well as Valentine's daughter Katherine. Together, they approached the Salthook scavengers to purchase Old Tech. However, one was an assassin in disguise, and attempted to stab Valentine. Tom managed to stop the attack, and pursued the girl towards the furnace district.

The would-be killer revealed her name to be Hester Shaw. She claimed that Valentine was responsible for her disfigurement before leaping down a waste chute. Shortly after, Valentine arrived and to Tom's surprise, pushed him down after her.

Together, Tom and Hester trailed London, eventually being picked up by Speedwell. However, the mayor had the pair drugged with the intention of selling them as slaves. They managed to escape, chased by the slavers. They were rescued by Anna Fang, who smuggled them to Airhaven aboard the Jenny Haniver.

Tom, Hester and Anna dined at the Gasbag and Gondola inn, accompanied by several of her Anti-Tractionist friends. The dinner was interrupted by the arrival of Shrike, a Stalker sent by London mayor Magnus Crome to kill Hester. While the aviators held off Shrike, Tom and Hester escaped Airhaven on a hot air balloon.

The pair then climbed onto the pirate suburb of Tunbridge Wheels. Chrysler Peavey took a shine to Tom, considering him a "gentleman" for originating from London. However, the brutality of the pirates caused Tom to grow disillusioned with the concept of Municipal Darwinism. After Peavey's men mutinied, Shrike caught up with Tom and Hester. The Stalker revealed his intention to kill Hester and have her resurrected as his daughter, but before Hester could be executed, Tom stabbed and killed him.

Tom and Hester then reunited with Anna, who took them to Shan Guo to warn the citizens of MEDUSA. Tom spotted Valentine disguised as a monk, and raced to find Anna and Hester. Witnessing Valentine kill Anna, he resolved to return to London with Hester and help her kill the Head Historian.

After dropping Hester onto London, Tom was attacked by the 13th Floor Elevator. He succeeded in shooting it down, inadvertently killing Bevis Pod.

Hester, meanwhile, was captured and taken to Valentine. However, she was freed after Katherine was stabbed and fell on MEDUSA's console, causing it to malfunction. She quickly left London with Tom in the airship. MEDUSA finally misfired, obliterating most of the city and killing Valentine. Hester tried to comfort a grief-stricken Tom as they flew away in the Jenny Haniver, apparently the only survivors of the incident, and made their way to the Bird Roads.

Predator's Gold

After two years working as an air-trader alongside Hester, Tom came into contact with Nimrod Pennyroyal, an author who requested transport to Brighton. However, the Jenny Haniver was chased by the Green Storm, an organisation that regarded the ship as stolen. Tom flew the airship through the streets of Novaya-Nizhni to evade the pursuers, and although he was successful, the Jenny was heavily damaged. Eventually, the ship drifted towards Anchorage.

While the Jenny was being repaired, Tom and Freya Rasmussen, the margravine of the city, became infatuated with each other, resulting in a drunken kiss witnessed by Hester and Caul, a Lost Boy. Tom was later awoken by Caul in time to witness a distressed Hester take off in the Jenny.

Unable to convince Freya to turn back Anchorage, Tom spent his time investigating the burglaries occurring around the city. After a heated exchange with Pennyroyal, Tom realised that the author's books were complete fantasies- however, the idea of parasite towns was not. Tom was kidnapped by the Lost Boys upon discovering a spider-cam, and taken to Grimsby.

At the underwater lair, Uncle revealed that Hester was being held captive by the Green Storm at Rogue's Roost. Uncle offered the Lost Boys to take Tom there- ostensibly so that Tom could save Hester, and Uncle could spy on the Green Storm.

Tom was immediately attacked by Stalker Birds upon his arrival at Rogue's Roost, then captured. He was taken to Hester's cell by Sathya, one of Anna's old friends, and almost executed. However, Caul triggered the explosion of the spider-cams, cutting the power and ruining the base. Freed, Tom and Hester fled towards the Jenny Haniver. They were confronted by Sathya and the Stalker Fang, with Sathya encouraging the Stalker to kill them. Guided by vague memories of Tom's presence at Anna's death, the Stalker refused to do so, and allowed them to leave unharmed.

After returning to Anchorage, Tom came across Pennyroyal attempting to escape the city. Tom was accidentally shot by the author, who flew away in the Jenny

Infernal Devices

Tom spent fifteen years living on a now static Anchorage with Hester and their daughter, Wren. After Wren was kidnapped by Fishcake, he journeyed with Hester, Caul and Freya to Grimsby. Learning that Wren had likely been trapped at Brighton, he then travelled there with Hester.

Tom explained his situation to slaver Nabisco Shkin, in the hope that Shkin would simply give his daughter back. Instead, Shkin imprisoned him and took his wedding band, coercing Wren into stealing the Tin Book of Anchorage. Hester broke into the Shkin Corporation, freeing him and Fishcake, but Tom was frightened by her brutal murder of the guards.

Tom and Hester regained the Jenny Haniver from a Pennyroyal-themed exhibition, and flew up to Cloud 9. They were successful, but Wren revealed how Hester had betrayed Anchorage to the Huntsmen. Despite Tom's pleas, a deeply shaken Hester walked off, and he was forced to fly away on the Jenny without her.

A Darkling Plain

After six months of travelling with Wren, Tom visited a heart specialist in Peripatetiapolis about chest pains he had been suffering. He learned that Pennyroyal's bullet had caused a weakness in his heart that gave him only a few years left to live.

In the Traction City of Peripatetiapolis, Tom Natsworthy discovers that the bullet that Nimrod Pennyroyal shot him with in Predator's Gold has damaged his heart and he has not long to live, though he doesn’t tell his daughter Wren. Tom soon discovers a woman that resembles Clytie Potts, a London Apprentice Historian that he knew. When questioned, she tells him that her name is Cruwys Morchard and that she is transporting Old Tech devices. Unconvinced, Tom and Wren decide to pursue her, travelling on the Jenny Haniver to Murnau, a Traktionstadtsgesellschaft city, where they meet Wolf von Kobold, the son of the Mayor of Murnau and commander of the traction city Harrowbarrow. Wolf believes that the survivors of MEDUSA may be still inside London, and the three agree to make an expedition to London.

Tom and Wren meet Wolf on Harrowbarrow, a burrowing Traction City, which takes them closer to London. With Wolf accompanying them, they fly the Jenny Haniver over the Green Storm border, and finally reaching the debris field of London. There they discover that the survivors of MEDUSA have rebuilt a society in London, led by Tom’s old boss and now Mayor Chudleigh Pomeroy. Garamond, the paranoid head of security, convinces Pomeroy to keep them there as he suspects that they may inform others of London’s survival. Tom, Wren and Wolf eventually discover a new traction town being rebuilt near the ruins, a project that was in-progress long before Magnus Crome decided to use MEDUSA.

Tom, fearing for Wren, takes the Jenny Haniver to Tienjing, hoping to convince Naga to not use his supposed weapon. Tom leaves a letter to Wren saying his goodbyes and entrusting Theo to take care for her, admitting that he is dying. Wolf hears of Manchester’s destruction and is determined to continue on to London, claiming to his underlings that Harrowbarrow’s creeping nature will help them survive.

On-board the Jenny Haniver, Tom forgives Hester for selling Anchorage to Arkangel. Shrike finds Pennyroyal hiding, and the three tie him up. Stalker-birds attack the airship, severely damaging it. Shrike manages to save the three from being killed, but falls out of the ship and into the mountains. The airship downs near Fang’s old home, where Hester and Tom leave Pennyroyal. Fishcake, having heard the airship, confronts them and tries to kill Hester; but is stopped by the Stalker Fang. Fishcake demands she kills them, but the Stalker Fang hits him and Fishcake runs away. Tom’s heart begins to strain and he collapses. The Stalker Fang, deciding not to kill them as they will all die soon enough, takes Tom into the house as Hester follows.

The Stalker Fang explains to Tom and Hester that she destroyed various traction cities and Green Storm bases to make the two sides fight each other, giving her time to send a command to ODIN. This command targets the various destructive volcanoes around the Earth, which will erupt and kill mankind, but will "make the world green again". Fishcake finds Pennyroyal, and they plan to escape in Popjoy’s sky-yacht, but need the keys around the Stalker Fang’s neck. Pennyroyal finds an Anti-Stalker weapon that Hester dropped and makes his way toward the house. Tom attempts to convince the Anna-side of the Stalker to destroy ODIN, and the Stalker flashes between the converging personalities. Tom’s heart strains and he collapses again, whilst Pennyroyal takes the key to the sky-yacht and attempt to bring it to them to save Tom. As Hester carefully takes Tom outside, they see a twinkling star in the sky: ODIN destroying itself. Hester realises that the Stalker Fang had ordered the weapon to destroy itself. Pennyroyal attempts to fly the sky-yacht to Tom and Hester, but is threatened by Fishcake to leave them behind as revenge for leaving him on Brighton.

As he lay dying, weakly, Hester slowly drags him to a villa. Hester thinks there is no way out, but soon comes to terms and accepts there there is one way out.

As Tom lays there, he does not care what happened as he thinks to himself as lucky because he was loved by someone so strong, and brave, and beautiful. The last thing he ever heard was what Hester said: "It will be all right, Tom. Wherever we go now, whatever becomes of us, we'll be together, and it will be all right." Tom dies with Hester by his side. Hester commits suicide to join Tom. Shrike runs to them, but it was too late. He moves their bodies to a cave in Erdene Tezh, holding hands. Shrike stays with them until nature consumes their bodies. Tom and Hester are remembered when Shrike came out of his slumber and tells their story.

Mortal Engines (film)

Tom is first seen running throughout London to the London Mueseum while is Salzhaken being devoured. Chudleigh catches him as he runs into the museum and is warned about running off. Katherine then appears and asks for information on the Sixty Minute War. Tom shows Katherine around a room where all the stuff from the war is kept, unbeknownst that Herbert is watching them. As they leave the room, Katherine and Tom are approached by Herbert who says that Tom needs to go to the Gut to find relics. Katherine takes Tom to the Gut and make it in time to find a toaster in pristine condition for the museum, which is held by Thaddeus. When Hester Shaw attempts to murder Thaddeus, Tom stops her and she runs off. Tom chases Hester through the Gut until they both get trapped at the waste chute. Hester tries jumping into the chute, but Tom stops her. Hester growls at him, telling Tom to ask Thaddeus about Pandora Shaw and Hester Shaw. Hester then drops into the chute and out of London. After Thaddeus finds Tom and Tom tells Thaddeus what Hester said, Thaddeus kicks Tom out of London to hide the fact that Hester is Thaddeus' daughter.

Outside London, Tom wakes in a pile of trash that Hester has hid him in, while she steal his ID, pocket knife, and money. Tom follows Hester in the wild, talking out of curiosity and confusion, when she threatens him with his pocket knife, saying she had one shot to avenge her mother.


Hester Shaw

Tom was forced to ally with Hester after being kicked out of London by Thaddeus Valentine. Over the course of book one, they begin to trust each other. In book two, the pair fall in love with each other. As of Infernal Devices, Tom and Hester are married and have daughter named Wren. In A Darkling Plain, when Tom dies from heart failure after being shot by Pennyroyal in book two, Hester commits suicide out of grief.

Wren Natsworthy

Wren is Tom's daughter. Wren and Tom are shown to have a close relationship, with Wren almost always turning to her father for comfort and saying that he is the person she loves the most in the world. Tom used to rock her to sleep and pat her head when she was sick or frightened as a child, and cried while embracing Wren when they rescued her from Cloud 9.

Herbert Melliphant

Herbert Melephant was Tom's bully, as Tom was a Third Class apprentice and Herbert was a First Class Apprentice.

Chudleigh Pomeroy

Although raised by the Guild of the Historians after his parent's deaths in the Big Tilt, Chudleigh was the father figure and mentor to Tom.

Anna Fang

Anna Fang was Tom and Hester's ally during Mortal Engines. After book one, he and Hester inherit the Jenny Haniver from her.

Thaddeus Valentine

Thaddeus was Tom's idol in Mortal Engines before being revealed to be a pawn of Crome.

Freya Rasumussen

Freya took a liking to Tom during Predator's Gold, and the two seemed to be romantically interested in each other throughout the book. Freya kissing Tom leads to Hester leaving the city in a rage. Later on in Infernal Devices, they are seen to be close friends and Freya accompanies him to find Wren. While rescuing Wren from Cloud 9, Tom wishes that he had Freya with him rather than Hester after she abandons Fishcake.


  • "Tom" is a short form of the name "Thomas", the Greek form of the Aramaic name "Ta'oma", meaning "twin".
  • In the film, Thaddeus mentions that Tom's parents were Historians, which is why he was left in the care of them after they died. In the books, it is unknown what professions David and Rebecca had before their untimely deaths.


Fan Art

Film Screenshots