Thunder is an abandoned young cat who stumbles into a magical old mansion operated by a dazzling array of automatons and gizmos. Owned by a retired magician, the house is occupied by an assortment of his wacky assistants who don’t all welcome the new houseguest. But when the magician lands in the hospital and his scheming nephew puts the mansion up for sale, our young hero and his new friends join forces to save their magical home.