On his first day as a fourth-grader, Sune faces an unwanted surprise: a new boy occupies his seat, embodying everything Sune aspires to be—and his name is also Sune. This marks the worst possible start to the school year. With swords drawn and mighty laser guns at the ready, Sune, his younger brother, and best friend Sophie regularly dive into epic fantasy battles. Yet as summer holidays end, ten-year-old Sune confronts a real-world rival: the new classmate quickly wins over the others, sparking Sune's dread of losing Sophie to his namesake and nemesis.

Determined to reclaim his place, Sune reinvents himself, unleashing a cascade of tumultuous, outrageous consequences. Director Jon Holmberg's feature film debut blends ample humor with frequent fantastical forays, tackling the fear of not being good enough and the very human behaviors it ignites.

Based on the beloved “Sune” books by Anders Jacobsson and Sören Olsson—published in the USA, Germany, Russia, Spain, Scandinavia, the Netherlands, the Baltics, and Eastern Europe—Sune vs. Sune earned three nominations at the Swedish Film Awards and selection to the 2019 Berlin Film Festival's Generation program. This family adventure captures childhood rivalry, self-doubt, and redemption with charm and energy.