def get_banners(series):
    """
  Get all the banners of the series.
  
  :param series: the series created with :func:`~thetvdb_api.api.set_series`
  :returns: a dictionary of all the banners of the series provided by theTVDB.com.
  :rtype: dict
  :raises: :mod:`thetvdb_api.theTVDBError` if something went wrong
  """
    return series.get_banners()
