As it turns out, Polonium-204 is indeed a real element, and it is highly toxic.

However, the way thatKateportrays how the substance affects Winsteads character isnt exactly scientifically accurate.

Realizing that it was the man from the hotel who poisoned her, Kate goes searching for answers.

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By the time she finally gets her revenge, Kate accepts her inevitable death at the movies end.

Polonium was discovered by the famous physicist, Marie Curie, and her husband, Pierre, in 1898.

Symptoms of Polonium-210 poisoning include nausea and vomiting, hair loss, and bone marrow damage.

Mary Elizabeth Winstead in Kate on Netflix

However, unlike 210, Polonium-204 would not be a reliable method of poisoning someone in real life.

Its tough to say why the writers ofKatechose Polonium-204 as their poison of choice.

Split image of Kate and Ani/Jojima

An action crime thriller, Kate follows the titular character, a skilled assassin at the height of her game. But when she makes a careless mistake and compromises an assignment targeting a member of the Yakuza while in Tokyo, she discovers she’s been poisoned with a deadly serum that slowly kills her from the inside out, giving her less than 24 hours to exact revenge on her killers. As her body swiftly deteriorates, Kate forms an unlikely bond with the teenage daughter of one of her past victims.

Mary Elizabeth Winstead in Kate Movie

Two side by side images of the protagonists from Kate and Hanna

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