Unidentified green-skinned species (The Plants of Plunder)

This unnamed humanoid species once accidentally brought several species of dangerous alien plants into the hands of Human criminals.

Biology
Members of this species are humanoids with an overall Human-like build. However, they have green skin, and what appear to be very large eyes, or at least two white, rounded, triangular, downwards-pointing pieces of flesh coming down from the area where a Human's eyebrows would be. They do not appear to be conventional eyes, as they can be seen coming off of the aliens' faces. What is known is that their eyes at least consist of two small, black pupils, around the area where a Human's eyes would be. Other features include small upturned noses, small ears, and a lack of hair, at least atop their heads. Additionally, members of this species can shapeshift, able to take on a perfectly Human-like appearance. Hard blows to the head can both give this species amnesia and restore lost memories.

Culture and society
Scientists of this species are known to travel to other worlds to test the properties of alien plants in foreign soil, disguising as the natives of whatever planet they are on to not attract suspicion. Their scientists wear green jumpsuits with black boxers worn outside their jumpsuits, a white belt, and a white X-shaped design on their torso, with the intersection point of the X denoted by a circle.

Technology
Aliens have highly advanced technology, such as rocket-shaped spacecraft, colored red. In addition, aliens have raygun-shaped devices that shoot out electric arcs, capable of halting the growth and biological functions of various alien plants. It is unknown if these guns can produce lethal intensity or affect other species, such as Humans.

History
In the mid-20th century, a scientist of this species landed on Earth, seeking to use the planet as a testing ground for various plants he was carrying. He took on Human disguise and found that the plants grew very quickly in Earth's atmosphere, but a tree he planted rapidly extended its branches in his direction, hitting him on the head hard enough to give him amnesia. Due to his amnesia, he was unable to stop a group of criminals hiding nearby, who had seen him transform, from taking his plants to use for heists. The alien then left the area and stumbled around the streets, being picked up by the police, where they took the other seeds he was carrying, showing them to a Human vigilante known as Batman.

The alien was later captured by the criminals and take to a barn near his landing site, where the criminals tried to get the alien to tell them formulas for growing more plants. However, the alien was unable to tell them, and a criminal shoved him into a desk, where he hit his head again. The blow made the alien regain his memories, just as Batman and his sidekick, Robin, arrived to combat the criminals. As the battle moved outside, with the criminals attempting to use more alien plants against the duo, the alien reverted to his true appearance, drawing his raygun to neutralize the plants. Batman and Robin soon subdued the criminals, allowing the alien to explain his backstory, and the alien also decided to leave Earth as to eliminate the danger his plants posed.

Appearances

 * Batman Vol 1 #147 (1962)