The Xenomorphs from the 'Alien' franchise are quite memorable. They are terrifying aliens with a unique life cycle. Their acid - for - blood and stealthy hunting style make them very formidable opponents in the fictional world.
The Vulcans in 'Star Trek' are great. They are known for their logical thinking and stoic nature. Their culture, which values reason above all else, has provided many interesting storylines. They also have unique physical features like pointed ears, and their telepathic abilities are fascinating.
One of the best aliens is the Martians from H.G. Wells' 'The War of the Worlds'. They are highly intelligent and their advanced technology makes them a formidable force. Their tripods are iconic symbols of their invasion.
The Xenomorphs from the 'Alien' series are really popular. Their unique and terrifying appearance, with the elongated head and the acid - blood, makes them memorable. They are also highly intelligent in a predatory way. Another popular one is Yoda from 'Star Wars'. Even though he's more of a wise alien, his small, green, and wrinkled look along with his powerful Force abilities have made him a beloved character.
One of the strongest aliens in fiction is Superman. Technically he is an alien from Krypton. His powers include super strength, flight, heat vision, and super - speed, which make him extremely formidable.
One of the best is 'Ender's Game' by Orson Scott Card. It has a complex alien race, the Formics. The story follows a young boy, Ender, who is trained to fight against them. Another great one is 'The War of the Worlds' by H.G. Wells. It's a classic where Martians invade Earth. And 'Contact' by Carl Sagan is also excellent. It focuses on the discovery of an alien signal and humanity's attempt to make contact.
Unique appearance. For example, the Na'vi from 'Avatar'. Their blue - skinned, large - eyed look is very distinct. They also have a strong connection to their planet Pandora, which makes them interesting.
One of the most powerful aliens in fiction is Galactus from Marvel Comics. He is a cosmic entity that consumes planets to sustain his energy. His power is so immense that he can easily destroy entire civilizations. Another is Q from Star Trek. Q is a being of pure energy with god - like powers, able to manipulate time, space, and matter at will. And then there's Darkseid from DC Comics. He is a tyrannical ruler of Apokolips, with superhuman strength, the Omega Beams which can track and disintegrate targets, and near - omnipotent power in the DC Universe.
One of the most famous aliens in fiction is E.T. from the movie 'E.T. the Extra - Terrestrial'. He is a small, gentle alien with a big head and a long neck. Another well - known alien is Yoda from 'Star Wars'. Yoda is a wise and powerful Jedi Master, despite his small stature. And then there's Mr. Spock from 'Star Trek'. He is half - Vulcan, with his logical thinking and pointy ears making him an iconic alien character.
Well, one factor is their appearance. For example, the Na'vi from 'Avatar'. Their tall, blue, and slender bodies with a connection to nature are visually striking. Another is their abilities. The Jedi in 'Star Wars' could be considered a type of 'alien' in a sense. Their use of the Force, which allows them to do amazing things like telekinesis and mind control, makes them stand out.
I think 'The Hitchhiker's Guide to the Galaxy' is really well - known. It has a cult following. There are these really zany aliens like the Vogons. Then there's 'War of the Worlds'. Everyone knows about the Martians coming to attack Earth in that story. It was really revolutionary when it was first published.