Characters Who Reappear

Characters who are introduced in the first Dominic Flandry novel and who reappear or are mentioned later in the Technic History (more than you might think):

Lord Advisor Petroff, mentioned later;
Lord Advisor Chardon, mentioned later;
Dominic Flandry;
Max Abrams, later seen in a reminiscence by Miriam;
Miriam Abrams, here seen by Max in a family picture;
Dragoika;
John Ridenour;
Tachwyr the Dark;
Persis d'Io, later mentioned in connection with her son by Flandry.

Important Planets:

Starkad, because Starkadians are evacuated to Imhotep;
Irumclaw, because Flandry is stationed there next.

The novel also introduces the Terran-Merseian conflict which endures throughout the Flandry series but, like everything else, does not go on forever.