* AlternateCharacterInterpretation: Are Seaton and company the incorruptible beacons of good and ideal specimens of humanity that the book portrays them as, or are they impetuous, [[ManChild Man-Children]] who [[ProtagonistCenteredMorality judge entire species based on first impressions]] and who accidentally stumbled upon something that the human race can by no means be trusted with, as shown by the fact that they have no qualms about killing their enemies to the last man, woman, and child, even when the latter try to retreat.
* DesignatedHero: The Kondalians have practically no traits that would be considered sympathetic by modern readers. They have no concept of democracy, race-based slavery is unquestioned, [[DoesThisRemindYouOfAnything they've been at war for 6000 years over ideology]], are {{Social Darwinist}}s who believe themselves a SuperiorSpecies, and admit to having no concept of mercy. All in all, they are no better than the Mardonalians; the only reason they are considered good is because [[ProtagonistCenteredMorality they were nice to the heroes]].
** Unlike the Mardonalians, and the villains generally in the series, the Kondalians are not [[AbsoluteXenophobe Absolute Xenophobes]], but willing to co-operate peacefully with other planets. That said, they ''are'' typically portrayed as a species of ProudWarriorRaceGuys, with a strong whiff of [[Literature/JohnCarterOfMars Barsoom]]. They're ''very flawed'' good guys, and they do occasionally get called out on their warmongering by the human protagonists. In fact Dunark eventually [[spoiler:decides not to share the knowledge Seaton gained from the Norlaminians with the rest of his species, since he knows that they can't be trusted with it]].
* EvilIsCool: [=DuQuesne=]. Come on, admit it.
* HarsherInHindsight: TheFederation's war against the Fenachrone. The latter are a bunch of [[ScaryDogmaticAliens malignantly expansionist]] RubberForeheadAliens planning to expand from their own single planet; Seaton and company object to their plans. So far, so good. Their reaction, however, is first to threaten and bully the Fenachrone with their own overwhelming might until they declare war on them in desperation, then -- When as defenders, they hold the moral high ground -- [[EarthShatteringKaboom nuke their planet]] and launch a near-successful attempt to [[FinalSolution exterminate the refugees completely]]. While it's clear the Fenachrone ''are'' aggressive militarists and potentially genocidal themselves, they also aren't really a threat to the vastly superior technology and numbers of the good guys at this point, and indeed have to display a fair amount of VillainousValor merely in order to survive the attempted genocide. Besides the questions of DisproportionateRetribution and general ValuesDissonance, to modern audiences the whole affair also reads a lot like the [[EagleLand Roosevelt administration's]] historical warmongering and bullying of ImperialJapan, which ultimately lead to Pearl Harbor, the Pacific War and Hiroshima.
* HilariousInHindsight:
** Nowadays, there is a real restaurant chain called Perkins. Considering how the character [[TheBrute was portrayed in the book]], it is potentially FridgeHorror.
** When the Norlaminians give Seaton knowledge of the inner workings of the universe, it includes the [[ScienceMarchesOn "fact"]] that subatomic particles are made up of smaller particles, which are made up of smaller particles, and so on ''ad infinitum''. About six years later, the classic short story "Literature/HeWhoShrank" would completely deconstruct this idea.
* MagnificentBastard: [=DuQuesne=].
* OlderThanTheyThink: A "dark star", essentially a black hole, and mushroom clouds produced by the atomic/total conversion of explosive shells. Both in ''The Skylark of Space'', published in '''1928'''.
** Early drafts are said to go all the way back to '''1916'''. That is ''sixty years before Star Wars.''
* ParanoiaFuel:
** The Fenachrone have mapped out the entire galaxy. Furthermore, they could invade a given planet at any time they want.
** By the end of ''Skylark Three'', the heroes can project themselves anywhere, can destroy whole planets with ease, and can reconstruct a perfect record of what anyone did at any point in the past. [[BigBrotherIsWatchingYou Just imagine that kind of power in the hands of a totalitarian state.]]
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