In this image, the first macrophage to receive and respond to poly(I:C)–loaded nanoparticles stands out like a spark igniting a flame. The immunostimulant (magenta) colocalizes with immune receptors (green), lighting up the cell’s internal machinery, while the nucleus (blue) and cytoskeleton (red) provide structural context. This initial activation signals the start of a coordinated immune response, potentially rallying neighboring cells to join the fight against ovarian cancer. Each activated cell adds fuel to the immune system’s growing fire. By improving targeted delivery, this work aims to minimize off-target effects while maximizing immune activation against tumors.