ALIENS AND SO FORTH ROUND-UP 053

Aliens. 

Molemen:

These green-skinned humanoids live in an underground kingdom somewhere beneath what was then known as the Belgian Congo. They have been sent to the surface to find some white men - and just why they subscribe to the racial categories of surface humanity is left unexplored - and woe betide any non-white guys who they encounter first.

The Molemen expedition eventually captures jungle adventurer Congo Jack and returns to the underground with him. Alas, we never quite learn what Queen Moletta of the Molemen wants a white guy for, because her interest in Jack inspires a real crisis in the ambitious expedition leader Sir Lugi and he draws most of the comic's ongoing focus with a series of attempted coups to seize power for himself. (Lightning Comics v2 001, 1941)

Blue Dwarfs:

One of Sir Lugi's schemes involves him teaming up with the Blue Dwarfs, ancient enemies of the Molemen, to seize the Moleman city by sneak attack.

The Blue Dwarf victory hinges on the fact that Sir Lugi knocks out Congo Jack in the first couple of minutes of battle. Once he comes to, Jack is able to not only retake the city after exactly one inspiring speech to the Moleman troops, but also slay the Blue Dwarf King Bobo to really drive the victory home. He is then granted his freedom by Queen Moletta. (Lightning Comics v2 002, 1941)

Martians:

Meteor Martin, one of the many short-lived Basil Wolverton sc-fi adventurers, is an officer of the Moon Patrol who sallies forth to combat an invading Martian space fleet and finds himself blasted into a strange otherworldly realm. 

The above is the only actual look we get at the Martians. Is their invasion successful? No idea. I do like their weird Wolvertonian tentacle arms, though.

Luckily for Martin, he finds himself in the company of fellow humans Rana and her father Romrak, who are able to fill him in on what has happened to him. The Martian weapon he was struck with sends its victims to a "negative world," implicitly another dimension. Further, the specific region that they are stranded in is a densely-packed cluster of planetoids called Gorikon. (Amazing-Man Comics 025, 1941) 

Bat Men:

Gorikon is awash with different lifeforms, though just how many of them are native to the place and how many have been sent there from the positive universe (or are the descendants of positive universe exiles) is unknown. When Meteor first encounters Rana, for example, she has been staked out as a sacrifice for Bat Men. (Amazing-Man Comics 025, 1941)

Desert Dwellers:

These excellent humanoid camel people (referred to as "savages" throughout, but that's a pretty rude thing to refer to an entire people as, so I'll just go with "dwellers") are the ones who are attempting to sacrifice Rana to the Bat Men, and if any species in Gorikon is going to get my vote for having actually evolved there it's them, if only because they have the weak muscles of a people who come from a low-gravity environment. Note how easily Meteor Martin beats them up, after all. (Amazing-Man Comics 025, 1941)

Assorted Gorikons:

Romrak and Rana have been residing in a village of interdimensional refugees, most of whom seem to be the same kind of near-human alien as series antagonist Groob here.

The inhabitants of Groob's village all seem to be the same kind of four-fingered humanoid as he is, though the presence of one little froggy guy with super-vision in Amazing-Man Comics 026 introduces the possibility of a more diverse cast of alien refugees that we sadly never get to see.

Please also note the fact that the low gravity and close orbits of the planets of Gorikon means that interplanetary travel is achievable by means of a human cannonball-style cannon (though how Groob intends to return is a mystery to me). (Amazing-Man Comics 025, 1941)

Insects:

Meteor, Rana, Romrak and Groob all end up in this quicksand-like trap set by a species referred to as the Insects by the other inhabitants of Gorikon, and true to alien monster convention the Insect who comes to check the trap makes off with Rana rather than one of the men.

Rana's fate is to be sacrificed in a pit of fire, though it is Meteor who ends up falling to his doom in the issue's cliffhanger. Sadly, there is no third Meteor Martin adventure and so we never learn a) how he gets out of it or b) whether these little green guys turn into the big green guy as part of their life-cycle or if he is some sort of distinct creature. I prefer the former! (Amazing-Man Comics 026, 1942)