Scott's species

Scott's species are an unnamed humanoid species who sought to exterminate Humanity for their own benefit.

Biology
Scott's species appears indistinguishable from Humans, at least in outward appearance. Any other physiological differences are unknown, but they have displayed telekinetic abilities. While the environment of their homeworld is unknown, Earth's environment appears to be perfectly hospitable to them.

Culture and society
Scott's species appears to be facing overpopulation, and seek out habitable worlds to expand on. While they are willing to kill off natives of these planets in order to acquire them with seemingly no remorse, they appear to only do so if said natives are deemed destructive and harmful to other societies, as they appear to have presumably peaceful relations with some other species. This species appears to be ruled in a monarchy or dictatorship, led by an unnamed leader who appears on screens as only a single giant eyeball, possibly an AI or the digitized consciousness of a member of this species. Scott's species also appears to have a hard time expressing emotions, although Scott himself was able to form a relationship with a Human woman, one strong enough to question the leader's goals. Agents of this species' military and government utilize a symbol to denote their status, resembling three rhombus-like shapes, stacked vertically and fused together and thus never showing all four points, with the middle shape longer than the other two, and all in a circle. Scott, Fred, and Steve, disguised as bikers, would publicly display this symbol, even among Humans, presumably because they are aware that no Human would recognize the symbol, with Humans that saw it mistaking it for the symbol of a biker gang.

Technology
Scott's species possess the capability to travel across vast interstellar distances. They have also developed bioweapons with the capability of killing off all life on a planet, spread through liquids. They are able to establish communication uplinks between Earth and their homeworld, using hefty equipment that bears resemblance to radio equipment.

History
Scott's species achieved an advanced technological stage, but needed more room for their species to expand. At some point in the 20th century, they examined Earth's inhabitants, deeming Humanity to be violent and hateful, prompting them to kill off Humanity for their own gain. Some members of this species, including three codenamed Scott, Fred, and Steve, arrived on Earth as an advanced invasion force, with Scott, Fred, and Steve blending in as three Humans in a biker gang, while others took on other disguises. They are ordered to poison Earth's water supplies with a bioweapon. To do this, they rent a house in a suburban area, using it as a base of operations while prepping to poison the water supply, acting rather suspiciously to their neighbors. Despite the nature of their mission, the youngest of the three, Scott, falls in love with a girl living next to them, named Ellen Tillman. Scott, bonding with her, decides to reveal the alien invasion plan to her, but she doesn't believe him. Ellen's father calls the police to take Scott away, and the deputy who takes Scott away is another member of the invasion force, revealing himself with a keychain bearing the alien symbol. Scott then contacts the leader, pleading with him to call off the invasion, as Scott has seen that there is good in Humanity, arguing that their scouts only saw the worst of Humanity. However, the leader refuses to call off the invasion, calling Scott a traitor. Scott tries to warn the Tillmans of the impending bioweapon deployment, but is intercepted by the same infiltrator deputy. Scott is presumably imprisoned or executed, and the plan is set in motion, dooming Humanity to extermination as the aliens took over the planet.

Appearances

 * The Twilight Zone, s05e18, "Black Leather Jackets" (1964)