So-called truthers argue Nibiru – also known as Planet X – is hurtling through the solar system and will soon unleash chaos on Earth.
It is believed its huge gravitational pull will cause devastating earthquakes and tsunamis.
Prominent researcher David Meade believes humanity could witness naked-eye sightings “early next year”.
The conspiracy theorist is now preparing for the so-called apocalypse.
He told Daily Star Online: “The events of the next several months are so major that as they say in the Intel community, I’m going ‘in the dark’.
“The events are so huge and are both supernatural and major natural cataclysms that I wish to leave it at that.
“It’s a surprise ending. It has nothing to do with politics, nor with man, actually.
“It’s predetermined and about to transpire. It’s straight out of the Book of Revelation.”
Claims that Nibiru will smash into Earth are to happen on the 21st of this month
“It’s predetermined and about to transpire. It’s straight out of the Book of Revelation”
Nibiru researcher David Meade
Other doomsayers are concerned that Planet X will soon appear – and may even already be in our skies.
Conspiracy theorist Paul Begley said: “There are asteroids, meteors – it’s all happening. The heavens are being shaken by some type of force, a gravitational pull.
“People are spotting now what looks like potentially Planet X.
“I have from one night three different people send me pictures pictures of what looks like a Planet X.”
He also pointed to a Bible passage from Luke 21: 25
It reads: “There will be signs in the sun, moon and stars. On the earth, nations will be in anguish and perplexity at the roaring and tossing of the sea.”
Many have claimed the mythical giant is already here, with sightings reported across the world.
Daily Star Online previously revealed the 12 safest countries if Planet X does appear.
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Despite the horrific prophecies, Mr Meade believes the human race can rebuild after the disaster.
He told Daily Star Online: “Nibiru will only affect one third to half of the earth. Major rebuilding will be needed. It is not an extinction-level event.
“In fact, after these days of trouble, according to the Book of Revelation there will be 1,000 years of peace – called ‘The Millennium’.”
However, there will supposedly be seven years of “Tribulation” before humanity can advance.