A disappointingly humanoid bunch of aliens today.
Gigantians:
The Gigantians of Gigantia are the kind of advanced society who like nothing more than to gas on about how primitive and backward Earth is to space travellers like Rocket Rooney and his pal, but are still content to have a hereditary monarchy. True to their name, they are super huge in their natural state but have the good graces to shrink themselves down whenever their Earth visitors show up. (Bill Barnes, America's Air Ace Comics 003, 1941)
Inhabitants of Starergo:
Though the Gigantians are a benevolent and technically advanced super species who live in a perfect society, they are frequently beset by various enemies who want nothing more than to utterly destroy them and who give them the opportunity to demonstrate their benevolent and advanced weapons systems - one might almost believe that they enjoy the opportunity to blast some of the nonenlightened now and again.
These include the inhabitants of Starergo, who attack them on the same day every year and have done so for the past one thousand years, and even though the attack always ends in a Starergoan defeat, this does not deter them. We never actually see one of the inhabitants of Starergo, but the fact that their planet's name is "ogre rats" backward possibly indicates something of their character. (Bill Barnes, America's Air Ace Comics 003, 1941)
Merzoatics:
The Merzoatics are another in the seemingly endless list of species who want the Gigantians dead, and since their attack is entirely ground-based (they have tanks and artillery in addition to the swords and pikes pictured here) we must assume that they are also native to Gigantia. This does not, alas, help them avoid the rays to the Gigantians' paralysis ray cannon. (Bill Barnes, America's Air Ace Comics 004, 1941)
Martians:
These Martians are from the year 3090 CE or thereabout, which means that it is reasonably probable that they are descended from Earth colonists rather than being native to Mars. Whatever their origins, they have let a bald jerk named Pytho rise to power and convince them to enact aggression on the peoples of Mercury, a situation which continues until Pytho is undone by the efforts of the heroic Planet Payson. (Planet Comics 006, 1941)



















































