Mysterious exoplanet likely to make its way to our solar system

The planet, which is nicknamed planet X, is a planet wandering through space. It is theorized that the planet actually makes it's way into the solar system, indicating it's likely going around our sun in an elliptical pattern. It is also theorized that this planet may some day collide with Earth. The fact are that, there are multiple exoplanets that do similar orbits around our sun. These planets are outside of Pluto and most, if not all, are too small to truly be considered a planet. The orbits of these planets differ quite a lot from the rest of the planets in that they're orbit is much more elliptical. So, these planets first make their closest approach to the sun after which they pretty much exit the solar system for some time, making their way so far away from the sun that it is amazing, to say the least.