When the Masters arrive outside Snake Mountain, Skeletor addresses them via a microphone. One of the play features in the 1984 Snake Mountain play-set was a large microphone which provided the voice of anyone who spoke into it with an ominous echo.
Snake Mountain is located in a region called the 'Fright Zone'. Usually this name is associated with the headquarters of the Evil Horde and located on Eternia's sister planet, Etheria. The UK World Masters of the Universe Annuals and German Motu Audio plays did feature versions of the Fright Zone located on Eternia, but they were never connected to Skeletor's Evil Warriors or the history of the Snake Men.