moves Stirling's Draka onto British territory;
shows them in their true and full horror;
unexpectedly shows them suffering a local defeat;
presents philosophical/theological discussion of the superman and God.
That is quite a lot. I have three more Drakas! stories to read and have also started to reread Stirling's Conquistador. By the very nature of the premise, these characters from different Earths could meet in any new volume - but only if that generates a worthwhile narrative.
We read these works both on their own merits and for their place in an sf tradition. Thus, Robert Heinlein has showed up in Drakas! and Poul Anderson in The Stone Dogs.
