Minister Mason

"When the foot seeks the place of the head, the sacred line is crossed. Know your place. Keep your place. Be a shoe."

- Mason explaining the situation to the tail passengers Deputy-Minister Mason is the secondary antagonist of the 2013 South Korean/American science fiction thriller film Snowpiercer.

She is portrayed by british actress Tilda Swinton.

Mason is the is the embassador of the head of the train in the tail of train, she keeps the tail passengers in line, she first appears giving a speech after tail children are taken by Wilford's men to the front and Andrew, father of one of the kids, throws a shoe at them, so he is punished by forcing him to take his right arm to the freezing cold outside until his arm is frozen and breakable, during Mason's speech she explains why the tail passengers must know their place in the train so the peace and order remain in the train.

After Curtis revolution starts, they are surprised by Wilford's assassins and Mason, she tells them how dissapointed she is, but still a battle starts, when the train enters a tunnel and everything goes dark, Mason is stabbed in the leg and Curtis has to decide between rescuing his second in command and best friend Edgar or getting Mason before she is rescued by Wilford's men, he chooses Mason and Edgar is killed, Mason is taken captive.

Later after discovering that the protein bars that are feeded to the tail passengers are made of dead animals and head passengers trash, Curtis tries to kill Mason but in terror she makes a deal with Curtis, she'll take them to the Head of the train with Wilford guaranteeing their safe passage at the same time, she then removes her fake teeth as a symbol of compromise.

During their journey to their head, they find the aquarium wagon where Mason offers them sushi from a sushi station, there she explains why sushi is served only twice in a year, she explains that they must control a sustainable balance in the ecosystem, then while Curtis friends are eating, mason tries to eat as well but Curtis stops her and gives her a protein bar instead knowing that Mason knows what they are made of, Mason eats disgusted.

When Curtis and the others are taken to the school wagon, they learn Wilford and the train story, then a bald man with a wheelbarrow full of New Year boiled eggs arrives and offers them, Mason refuses, the bald man continues offering eggs to the rest of the passengers, until he arrive to the wagon where the rest of the revolutionary passengers are hiding, meanwhile, Curtis finds a message from the head anonymous informant that said "BLOOD", after this, the school teacher and the bald man start shooting against the tail passengers, while the bald man kills all of the passengers, the teacher only kills one of them and is later stabbed in the neck, taking advantage of the chaos, Mason crawls to the teacher's corpse, grab her gun and tries to shoot Curtis but he stops her, a transmission is shown on the classroom T.V where Wilfords men kill Curtis's mentor Gilliam and the other passengers, in anger he grabs the teacher's gun and walks to Mason, she tries to reason with him one more time, but is pointless, Mason begs for mercy saying that the attack wasn't her fault, but Curtis shoots her in the face anyways, her corpse is later found by Wilford's men.