Rudolf was an impostor who claimed to be the long-lost "cousin" of Princess Grace. He sought to overthrow the kingdom while while pretending that the lost prince had returned. He claimed to be second in line to the throne and challenged the princess' rights. He hid the map to the location of the Ruby Wings in a safe in the reading room, as whomever wore them would rule the kingdom. When Baloo and Airplane Jane found out his secret, Rudolf tried to stop them, pursuing them in a heavily armed blimp. But Rudolf was defeated when Baloo tore a hole in the blimp's balloons with an anchor, where it crashed into the water.