If this was going to happen, NASA'd have already have seen it. It's two months before the supposed date.
I agree. Planets do not sneak up on you like that. In fact, I remember simulating a series of rough scenarios for a planet capable of actually destroying the
planet of Earth, which is what the doomsayers claim.
Such a planet would be incapable of both being on any form of collision course with
anything in our solar system and also hiding behind anything long enough that we haven't been able to spot it since the doomsayers started saying "
DOOM!"
Unless it's not a planet, but a black hole, in which case we'll still get a period of warning when the orbits of the other planets and the Sun all start going haywire. There are very few black holes with a gravitational effect small enough to get vaguely near us before we'd notice their effects. (Except for micro-black holes, which evaporate in seconds or shorter and wouldn't realistically pose a threat to us.)