Making the Mortal Engines Movie

News, views, quotes and trivia about Philip Reeve's 'Mortal Engines' books and the Peter Jackson movie production.

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Monday, October 16, 2017

What is the MEDUSA weapon in Mortal Engines?

medusa being fired from London


The MEDUSA was the ancient Old-Tech super weapon that the Mayor of London city tried to use to breach the Shield Wall.

Magnus Chrome, the Mayor of London, intended to use the Medusa weapon against the Walk so that he could take London City through to the fertile hunting grounds beyond the wall.

But what exactly is the Medusa and how is it used. Does it make you turn to stone if you look at it too long?

MEDUSA is a 'ground-based' weapon.

It is stated in the Mortal Engines novel as taking up the whole of the inside of St Paul's Cathedral, where the Guild of Engineers had rebuilt it under complete secrecy.

Philip Reeve described as having a huge, metallic hood shaped 'like a cobra's hood'. It fires a beam of energy (either sourced from outside the real universe, or the cities generators), resembling a "cat-o-nine-tails", at targets up to two hundred miles away.

The firing coordinates are input via a control panel at the base of the firing mechanism.

In Mortal Engines, the Medusa was never actually used as intended.

It was accidentally destroyed by Katherine Valentine who was mortally wounded during her noble attempt to sabotage it. She succeeded somewhat - the Medusa was unable to be fired by Magnus Chrome but it did over heat, blow up and destroy the city of London with it.

The resulting explosion killed most of the thousands of people living in the city, many of them innocent.

Medusa weapon concept art from Mortal Engines
The Engineers prepare Medusa for firing

So where did the Medusa weapon come from?


The weapon was originally deployed in America during the infamous Sixty Minute War, the one which turned planet Earth into a post-apocalyptic wasteland from which the traction cities eventually evolved from. This is not to say the Medusa was the only weapon used that caused the destruction. The satellite systems known as ODIN wreaked a fair amount of damage.

Many thousands of years after the great War, London secretly made archeological expeditions to the Dead Continent and gathered the pieces of Medusa from an old Brothal base and re-assembled it inside the St Paul's complex.

In a key plot point which echoed a generation,  Thaddeus Valentine (working for Magnus Chrome)  had years before the events of the book, sort to obtain the computer control system of the Medusa. A fabulously complex item of technology even by the standards of scientists from the pre-war era,

Valentine tracked it to being in the hands of Hester's parents, found them and killed them. During this horrible moment, he also scarred Hester, both physically and of course mentally.

So what is the plot of Mortal Engines in relation to Medusa?


Katherine Valentine spends most of the first part of Mortal Engines trying to figure out what MEDUSA is. Then, when the city of London is being chased by the city Panzerstadt-Bayreuth the roof of St Paul's Cathedral lifts up and destroys the predator city with a blast of pure energy.

The successful use of the weapon serves as proof of concept to Magnus Chrome and it further adds to his resolve to breach the Shield Wall.

Magnus' plans are ultimately foiled when MEDUSA system overloads with energy and explodes, obliterating most of London with it.



Concept art of Medusa being opened above Saint Paul's Cathedral by Jaekyung Jaguar Lee. Medusa firing art design by Peter Yea.

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