In 1999, now-deceased Columbian New Age author V. M. Rabolu published a book entitled "Hercolubus or Red Planet". In it, he promoted the idea that Barnard's Star is really a planet, which was known to the ancients as Hercolubus. According to Rabolu, Hercolubus was responsible for the destruction of the mythical continent of Atlantis. Furthermore, Rabolu was likewise convinced that Hercolubus will approach the Earth again at some point in the future.
However, V. M. Rabolu was not the first person to propose the existence of a planet called Hercolubus. In fact, it is very evident that he borrowed his ideas from fellow Columbian New Age author -- and founder of the Universal Christian Gnostic Movement -- Samael Aun Weor, who in the 1970's proposed that Hercolubus was part of a distant solar system which revolves around Barnard's Star. In a lecture he delivered in 1976 in Guadalajara, Mexico, called "The End of the Kali Yuga", Weor talks about how the Earth will experience a polar shift at the end of the Age of Aquarius. According to Weor, this polar shift will result in the submergence of our current continents, and obviously, the destruction of most of mankind. In his lecture, Weor also points out that this cycle of destruction will be accelerated due to the approach of the planet Hercolubus.
For the record, there are no serious astronomers who actually believe in the existence of Hercolubus or Nibiru. It is purely New Age nonsense. For additional information, please refer to the following articles and series:
2012: New Age Deception and Psychobabble
The Nibiru Planet X Wormwood Controversy
Comet Elenin, Hercolubus, Nibiru, and Planet X