Planet X Conspiracy Theory

I do love a good conspiracy theory and pride myself on knowing most of them but but i heard one that seems to have passed me by but inevitably ends with us all being killed horribly.
Scientists have began a search for the elusive ninth planet which they think may be orbiting on the outer edge of our solar system after being flung there while the other planets shifted towards the Sun and they have encouraging initial evidence that Planet Nine really exists and are attempting to get observational evidence.
If a hidden planet exists, it’s 400-800 times farther away from the Sun than Earth. So it would trace an elongated 20,000-year orbit so us Humans were busy looking for sharp stones and waiting for someone to invent cutlery the last time it swung around our star.
So far so good, since Pluto got booted out of the Planet Club we have a space for a new Planet but conspiracy theorists have leapt to the conclusion that Planet Nine must be 'Planet X' which is destined to destroy Earth at some point soon.
The theory is that 'Planet X will sweep through the inner Solar System causing Earth to undergo a physical pole shift that would destroy most of humanity according to Russian author Zecharia Sitchin who named the planet Nibiru and based his findings on Babylonian and Sumerian mythology.
Please bear in mind that the original date for our destruction by the new Planet was 2003 but this was postponed when 2004 turned up and we were still here so i am going to go out on a limb and say that this can be filed under 'one for the crazies' and we can look forward to still being here for the Eurovision song contest in May where i have my own conspiracy theory that we have entered a song so monstrously bad that we have no chance of winning so avoid the cost of having to stage it next year, austerity and all that.