Cult is a Third-Party role that has the night power to recruit a person to the Cult. If the Cult kills everyone off, they win. The only things that prevent them from recruiting are Protection (Nothing happens) or Godfather (Cult Leader dies and a Cultist is selected as the Cult Leader most of the time). Cult is stupid overpowered if not eliminated immediately and so there is no way in hell that there would be a Cultist and another Third-Party.