The Artificial Alien, also called the Synthetic Alien, is a possible myth in Grand Theft Auto: Vice City. It's also considered a vague Easter egg by the myth hunting community and a texture by skeptics.
The Synthetic Alien is an artificial structure on the sets of the fake Moon landing, which parodies a real conspiracy theory based on the Apollo 8 Moon landings. The alien is technically a texture that represents a humanoid or four-legged animal, similar to a polar bear, it’s grayish in color with a set of wide eyes. Players have formed a theory claiming that the alien is a reference to Buzz Aldrin’s claim of sighting aliens/UFOs on the Moon but this hasn’t received official confirmation and the mystery consisting of the alien's texture still remains unsolved but the texture is bears a strong resemblance to reported alien structures and beings on planets and moons around the solar system and particularly the Moon. However, it can be a result of detailed textures giving the impression of a humanoid.