~ Sugarplum about to bring the Tin Soldiers to life after Clara uses the key to activate the machine.
The Tin Soldiers are the secondary antagonists of the 2018 Disney film The Nutcracker and the Four Realms. They are life-sized toy soldiers created by the Sugar Plum Fairy in her plot to take over the Four Realms.
Nothing much is shown of the Tin Soldiers' behavior, except for the fact that they are loyal to Sugarplum in her plot to take over the Four Realms, even activating the machine to create more of themselves to enforce Sugarplum's reign. They are also willing to kill any enemies who would dare defy Sugarplum's new reign; this was shown with them raising their swords to fight Mother Ginger's minions and gang of mice, and even one of them attempts to strike down Captain Phillip Hoffman without hesitation.
Following the departure of Queen Marie Stahlbaum as she wanted to be with her family, Sugarplum felt embittered and decided to take over the Four Realms as its new Queen (despite the fact that Marie left Sugarplum and the other three regents in complete control of the Four Realms). To do so, Sugarplum created a series of toy soldiers and found out that Marie had created a machine that can turn toys into living objects with the utilization of a key that can activate it. However, Mother Ginger learns of the plot and tried to stop Sugarplum, but the latter frames her, resulting Ginger to be banished within her own Realm (the Land of Amusements) and the other three realms to wage war. However, Sugarplum is upset to learn that the key is lost in the forest.
It was never until the arrival of Marie's youngest daughter Clara, who found the key in a tree before it was stolen by a mouse (who is working for Ginger). After meeting up with Sugarplum and the other regents, Clara manages to steal back the key before reuniting with Sugarplum and the other regents. Delighted by this, Sugarplum reveals her true colors by using the key to activate the machine into creating the Tin Soldiers, confessing that she intends to use the Tin Soldiers to take over all Four Realms and rebuild them in her own image. Sugarplum then imprisons Clara and the other regents to ensure that they won't get in the way; even when Captain Phillip Hoffman furiously attempts to defend Clara, two of the Tin Soldiers easily disarmed him and had him locked up with the others. The Tin Soldiers were also given free reign over the machine to create more of themselves for the imminent invasion.
However, Clara and the others were able to escape while Hoffman convinces Ginger and her minions into helping them into foiling Sugarplum's plot. As Sugarplum directs her Tin Soldier army into invading the Land of Amusements, Hoffman and Ginger's minions manage to fight off several Tin Soldiers, allowing Clara and Ginger to successfully enter the machine's room where Clara shuts down the machine, causing the palace's water wheels to cease rotating and catching Sugarplum's attention.
As Ginger fights off several Tin Soldiers to buy Clara more time, an angry Sugarplum summons more Tin Soldiers to trap Ginger and Clara. They all watch without emotion as Sugarplum intends to turn Ginger into a toy with the machine, but Clara has already reprogrammed the machine into zapping Sugarplum, turning her back into a lifeless porcelain doll as punishment for her crimes. With Sugarplum's magic undone, all the Tin Soldiers became lifeless as they fell down in defeat.
With Sugarplum and the Tin Soldiers defeated, the Four Realms are finally at peace, and Clara is returned back to her family.
The Tin Soldiers being lead into battle after Sugarplum betrays Clara and the other regents.
A Tin Soldier attempting to strike down Clara.
Two Tin Soldiers trying to strike down Captain Philip Hoffman.