Vassals of the Lode-Star

"Vassals of the Lode-Star" by Gardner F. Fox is a science fiction adventure where Earthman Thor Masterson finds himself abruptly thrown into an alien world and a cosmic war against the ancient being Aava. After his home bafflingly merges with an alien landscape, Thor, demonstrating heroic qualities, quickly teams up with Karola. Together, they navigate bizarre dimensions, fighting androids and other strange creatures, seeking answers from a figure known as the "Discoverer." Thor's journey is driven by his determination to protect Karola and defeat Aava's looming threat, setting the stage for a high-stakes battle across twisted realities.