Krokodil is a homemade opioid cooked from codeine mixed with solvents like gasoline or paint thinner, and it spread through Siberia and other parts of Russia among users who could no longer afford or find heroin. The name comes from what it does to the body: repeated injection turns skin scaly and green at the injection site, then causes tissue to rot and slough off, exposing bone in the worst cases. The film stays close to that physical toll, showing the visible damage on users' arms and legs rather than treating it as an abstract statistic. It also traces why the drug took hold where it did, pointing to cheap over-the-counter codeine and the collapse of other supply routes as the conditions that made a drug this destructive attractive to people already addicted to something else. The footage is blunt about the outcome: users describe it as faster-acting and more accessible than heroin, and shorter-lived, since the damage it causes tends to kill within a few years of regular use.