Physicist Erom Reve discovers, to his dismay, that his traveling companion will be Daolgi Kar, a self-styled poet who brings his little dog Tippy.

They end up living in a cave by the sea and Erom struggles to make green glass, the highest denomination of Venusian currency.

They are given a hostile reception as vagabonds until Erom displays some green glass, then the villagers welcome him and Daolgi as Large Letter Men.

Working in secret, Erom has a set of new spacecars built for him and his friends and he builds a radio capable of communicating with Earth.

Their greed for colored glass exceeded only by their eagerness to slaughter each other, the Venusians use a newly invented death ray in their orgy of self-annihilation.