A doomsdayer claims the world as we know it is set to come to an end next month - although experts in the field say the threat is completely bogus.
Statistical researcher David Meade says a Nibiru cataclysm will bring about the destruction of Earth at some point between September 20 and September 23, 2017.
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A Nibiru cataclysm is the belief that a large planetary object - usually known as Nibiru or Planet X - will strike Earth or come close enough to cause destruction early in the 21st Century.
The theory is not backed up by any scientific evidence, and has been labelled the most common pseudoscientific topic brought up with astronomers.
That hasn't deterred Mr Meade, however - and the author says spiritual and physical preparation is a must as Nibiru reveals itself about halfway through September.
"We're definitely there - we're in the final months and years of the end right now," he said in a YouTube video.
"Not the end of the world - the world's going to go on for a long, long, long time - but we're coming head on into what the Bible calls the Great Tribulation... some people call it the apocalypse.
"One of the instruments that is going to be used to impact the Earth and create a lot of that disaster that we read about [in the Bible] is Planet X, or Nibiru."
Mr Meade says both scriptures in Revelation and readings of the Great Pyramid of Giza have pointed to September 2017 as the date at which the Nibiru will sweep past or strike Earth.
The teachings behind the Nibiru cataclysm have been rejected as nonsense both by scientific and Christian communities.
English particle physicist Brian Cox said in 2012 that "if anyone else asks me about Nibiru the imaginary bullsh*t planet I will slap them around their irrational heads with Newton's Principia".
The conspiracy theory hinges on the idea that the planet is already sitting within our solar system, and is hidden behind the sun so as to not be visible to people on Earth. Nibiru believers have accused NASA of covering up its existence.
Astronomers and planetary scientists have noted the laws of physics would not allow for another planet to be in our solar system, or that its existence would at least significantly alter conditions on Earth.