This film aims to raise awareness about the fight against cancer by highlighting the advances in research made possible through donations. By leveraging the Christmas season and the emotions it evokes, it conveys a universal message of hope and recovery. It immerses us in the daily life of Santa Claus during his battle with cancer, from the moment he discovers his illness, through the various treatments at Gustave Roussy, until his recovery. Like anyone facing illness, Santa Claus experiences moments of doubt, despair, sadness, but also joy. Thanks to advances in research and the support of Gustave Roussy, Santa Claus heals and can resume his rounds, his work, thus bringing happiness to millions of children.