The new planet came out of the infinite deeps of interstellar space, moved in towards the sun like a comet, and stayed-a new member of the Solar System, between Earth and Venus. Xenephrene it was named and it made a pretty vision in the evening sky . . . until other things...
Invaders from Xenophrene!! Armed with terrible weapons they land upon a Earth struggling with a demoralizing climatic upheaval!! Classsical science fiction at it's best!!