List of fictional alien species: S

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Name Source Type
Saiyan Dragon Ball Z A naturally aggressive warrior race who are, purportedly, the strongest warriors in the fictional Dragon Ball universe. Most of the Saiyans were exterminated by galactic overlord Frieza after Goku was born. With only few known survivors, they are functionally extinct. With the exception of their monkey-like tails, all Saiyans have an outward appearance identical to humans but with a larger, muscular build.
Sakkra Master of Orion
Sal-Kadeem Utopia
Salarians Mass Effect
San 'Shyuum Halo
Sandworm Dune universe
Sangheili Halo
Santeeians Bravest Warriors Santeeians worshipped Wankershim before being vaporized to become one with Wankershim.
Sariens Space Quest
Sarturians Utopia
Sathar Star Frontiers Worm-like tentacled antagonists
Sau-Bau Battlelords of the 23rd Century
Scarrans Farscape Humanoid
Schniarfeurs Valérian and Laureline
Scorvians Farscape Humanoid
Screwheads Invader Zim They were enslaved by the Irken Empire and currently the species works the Conveyor Belt Planet.
Scrin Command & Conquer
Scwozzworts Lunchbox and the Aliens Squid-like and non-humanoid
Sdanli Harry Turtledove's Worldwar series Large, fierce reptilian predators native to Home. In the very ancient history of the Race, petitioners who appeared before emperors (Ssumaz dynasty or otherwise, as this was long before the planet's political unification even by the standards of the Race's history) and did not show the proper respect were thrown to sdanli as a form of capital punishment. The punishment was later changed to a nonlethal, symbolic one: courtiers in sdanli-skin masks surround the disgraced individuals and mock them.
Sebaceans Farscape Humanoid. Genetically engineered offshoot of humans, harvested from Earth 27,000 years ago. Lower heat resistance than humans, but double the average life expectancy
Second through Last Men Olaf Stapledon's Last and First Men
Sectoids X-COM: UFO Defense
Seekers Advent Rising
Selay Star Trek
Selkath Star Wars Humanoid
Seraphim Supreme Commander
Sergeant Keroro Sgt. Frog
Sergeant Major Kururu Sgt. Frog
Séroni Space Trilogy Humanoid
Sevod Hary Turtledove's Worldwar series An avian species with reptilian characteristics that flew in the sky of Tau Ceti. Like many creatures found in Home, they had scales and eye-turrets; unlike birds, sevod and related species had featherless wings. The Sevod was renowned for making musical sounds in the evening and are related to squazeffi.
Shadoks Les Shadoks
Shadows Babylon 5 Arachnid, capable of phase-shifting to turn invisible
Shalka Doctor Who
Sharrh C. J. Cherryh's Alliance-Union universe
Sheeda Grant Morrison's Seven soldiers of Victory megaseries
Sheliak Star Trek
Shevar Ascendancy
Sheyangs Farscape
Shi'ar Marvel Comics Humanoid
Shinari Imperium Galactica II: Alliances
Shingouz Valérian comics
Shivans Descent: FreeSpace – The Great War
Shofixti Star Control
Shoggoths H. P. Lovecraft
Sholans Lisanne Norman - Sholan Alliance Feline humanoid
Shonunin C. J. Cherryh's Alliance-Union universe
Shroobs Mario & Luigi: Partners in Time
Silacoids X-COM: UFO Defense
Silfen Peter F. Hamilton's Pandora's Star Humanoid
Silicoids Master of Orion
Sirians Serious Sam: The First Encounter
Skaarj Unreal series
Skedar Perfect Dark
Skinnies Starship Troopers Humanoid
Skolarians Zak McKracken and the Alien Mindbenders
Skroderiders Vernor Vinge's A Fire Upon the Deep Sessile, plant-like beings mounted in personal mechanical vehicles ("skrodes")
Skrulls Marvel Comics
Slaughtering Rat People Invader Zim Physiologically similar to giant rats, the Slaughtering Rat People inhabited the planet Blorch before it was conquered by Invader Skoodge. Blorch was converted into a parking structure planet.
Slavers (see Thrint) Larry Niven's Known Space
Slitheen Doctor Who
Sludge Ben 10 mud-aliens
Slylandro Star Control
Snakemen X-COM: UFO Defense
Snarks Marvel Comics
Snotlings Warhammer 40,000 Humanoid
Snovemdomas Ascendancy
Solaris Stanisław Lem's Solaris
Solomon Family 3rd Rock from the Sun
Solon Haegemonia: Legions of Iron
Solrock Pokémon
Son'a Star Trek
Sontarans Doctor Who Stocky humanoid
Soomanii Utopia
Sorn C. S. Lewis' Space Trilogy
Soro David Brin's Uplift Universe
Sosiqui The Journeyman Project 3: Legacy of Time
Southern Aliens Bravest Warriors They have thick southern accents.
Space Chickens Bravest Warriors Physiologically similar to pigeons
Space Pirates Metroid series
Spathi Star Control
Species Species and its sequels Bipedal humanoid female aliens, and quadrupedal male aliens.
Species 8472 Star Trek
S'pht Marathon Trilogy
Spibbley Invader Zim
Spiridons Doctor Who
Spirits Stargate SG-1 Humanoid
Splixson Ben 10
Spoo Babylon 5
Squirps Super Paper Mario
Squiz-Quijy Utopia
Ssora Renegade Legion Reptilian
Ssvapi Harry Turtledove's Worldwar series A burrowing animal native to Rabotev 2. Throughout the Race's empire, they are notorious for showing extreme aggression and stubbornness in fighting to defend their burrow networks against predators and other intruders. The American defense of Chicago from 1942 to 1944 was compared to the territorial defensiveness of such animals by the Conquest Fleet that flew against Tosev 3.
Starmen EarthBound
Strogg Quake II and Quake 4
Stsho C. J. Cherryh's Chanur novels
Stu Pixar's Lifted
Sugarbellies Bravest Warriors They speak in high-pitched voices.
Suliban Star Trek Humanoid
Sun-Dog Terry Pratchett's The Dark Side of the Sun Large sentient beings that live in the vacuum of space. Capable of traveling through hyperspace. Any object they engulf will travel through hyperspace with them. The Sub-Dog species operate a successful business transporting spaceships across vast distances for other races in exchange for currency.
Sungs 2300 AD
Supox Star Control
Serrakin Stargate SG-1 Humanoid
Swaparamans Ascendancy
Sycorax Doctor Who Humanoid
Sye-Men Battlelords of the 23rd Century
Sykarians Farscape Humanoid
Symbiote Marvel Comics A fictional species of inorganic, amorphous extraterrestrial symbiotes appearing in American comic books published by Marvel Comics. The Klyntar bond with their hosts, creating a symbiotic bond through which a single entity is created. They also are able to slightly alter their hosts personalities, by influencing their darkest desires and wants, along with amplifying their physical and emotional traits and personality, granting them super-human abilities.
Syreen Star Control Humanoid