As the Powerpuff girls prepare for their last day of preschool, Blossom and Bubbles suddenly act strangely as Buttercup became suspicious of their behavior. suddenly their past exposed a dark plan HIM thought of. Buttercup being the only one who saw the change in her sisters, has to stop them and get them back to normal. however the pain the girls feel after losing their sister Bunny was too great that it was almost futile to Buttercup. will our toughest fighter save her sisters or will she fall victim to HIM's control or die fighting?