Universe Today's Fraser Cain nails it in just five words: "No. Nooooo. No. Just no." But then he explains how we know this, and what would happen if a planet were to suddenly materialize, in an orbital position hidden from our view by the Sun.
Eventually, our orbits would intersect, and there'd be an encounter. If we were lucky, the planets would miss each other, and be kicked into new, safer, more stable orbits around the Sun. And if we were unlucky, they'd collide with each other, forming a new super-sized Earth, killing everything on both planets, obviously.
[ Fraser Cain ]