They may not all be actual aliens, but they are all aliens and so forth.

M’Bujies:

We only really hear about the M’Bujies from the mouth of soldier/Blue Tracer sidekick Boomerang Jones, which makes me want to take his words with a pinch of salt, given, you know, the history of the world and whatnot. On the other hand, he is one of the protagonists of a fairly uncomplicated adventure comic so we can probably take most of the information we are given at face value without much risk of moral complicity. Regardless, we are told that the M’Bujies are a super-human offshoot of mankind who live in a fortress-city on the slopes of the volcano Ras Dashin in Ethiopia and who intend to conquer the world with their super-science.

“Wild” Bill Dunn, creator and pilot of super-vehicle the Blue Tracer attacks the M’bujie fortress-city in retaliation for their role in his origin story, when they attacked and wiped out his Army unit, and though they might have withstood his attack thanks to their super-science they are ultimately betrayed by their own volcano home, like so many who choose the volcano lifestyle. (Military Comics 001, 1941)

Nether-Men:

The Nether-Men are the wormy, armour-plated previously seen in our entry on their champion Rocko, in whose entry we explored some of the weirder aspects of their society, such as the fact that they have interplanetary travel and the ability to siphon off the energy output of a star in real time but seem to have no concept of automation, or rather they have the concept but have not worked out a way to implement it that does not require the energy of a star. They are also potentially our first extragalactic species, though this is based on text stating that Rocko traveled from “universe to universe” in search of a suitable star and is a) from a time when astronomical terms like “solar system” and “galaxy” and “universe” were frequently only loosely understood by comic book sci-fi writers and b) on the same page as a panel that says that he traveled about 10 light years.

Rocko’s plan hits a serious snag when the inhabitants of Earth object to their plans to kill them all by depriving them of solar radiation, and the majority of the Nether-Man population is killed off in the subsequent counter-attack. If only they had chosen a different star. (Planet Comics 005, 1940)

Octopi-Men:

These Octopi-Men attack Navy Jones and Princess Coral as they are searching for a lost treasure with their new friend Captain Nemo. They aren’t the kind of underwater humanoids (octopoids?) who speak while attacking you, so we don’t learn their motivations for doing so, even if it’s just out of sheer cussedness as their mean little faces suggest.

Despite their oddly scaly hides which give them a somewhat tougher appearance than your typical octopoid, the Octopi-Men are just as easily shot and punctured to death as any other subsea hostiles. (Science Comics 005, 1940)

Quintons:

After defeating the dastardly Satan Rex, Jon Linton (Flyer, Scientist, Adventurer) goes back to his first love: tinkering with experimental rocket ships. As a consequence of this, he, his scientific partner Dr Kane and Kane’s daughter Lisa end up careening across time and space in an out-of-control spacecraft that finally runs out of fuel and comes to a stop on the planet Quinton in the Fifth Dimension.

The Quintons, as represented by the friendly-but-smug Alpha 712, are a species comprised of mental force, who usually resemble a red orb balanced atop a small tornado but who can harness the power of their minds to adopt any conceivable corporeal form. They are also able to create matter, which comes in handy when it comes time to refuel Linton’s spaceship.

The Quintons are at war with another Fifth Dimensional group called the Nogos, and since everyone involved is an immortal thoughtform, “warfare” in this instance takes the form of assuming various outlandish shapes in an attempt to frighten one another to death. The Quinton war machine, hampered up to this point by the fact that they seem to have very poor imaginations, is given a tremendous boost by Linton and friends providing them with images of scary Earth dinosaurs to unleash on the Nogos.

I really liked the Nogos when I read their first appearance and thought that they looked like weird yellow sphere-men, but sadly their second and final appearance in Wham Comics 001 makes it clear that those were just war-forms and that the Nogos are the same sort of being as the Quintons. Very sad. (Amazing Mystery Funnies v3 008, 1940)