Porter (voiced by John Drofta) is no ordinary dog. After being brought home by a girl named Penny (voiced by Miley Cyrus), Porter is transformed by her father into a "super lightning dog". It has a reinforced skeleton, lightning speed, and infinite power. It wants to rescue its father who was kidnapped by the "green-eyed man" with Penny. With its power, Porter defeated countless powerful enemies. Of course, all this is only on the big screen. In fact, Porter and Penny are just performing a drama together. Porter does not have any superpowers, but he firmly believes that his power is real. After a filming, Porter, who confuses reality with drama, rushes out of the cage and goes to the street to save Penny. He cannot foresee that he will face a real and dangerous world without superpowers.