List of fictional alien species: S

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Name Source Type
"Species" Species and its sequels Bipedal humanoid female aliens, and quadrupedal male aliens.
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
Sandworm Dune universe
Sangheili Halo
Santeeians Bravest Warriors Santeeians worshipped Wankershim before being vaporized to become one with Wankershim.
San 'Shyuum Halo
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
Scwozzworts Lunchbox and the Aliens Squid-like and non-humanoid
Screwheads Invader Zim They were enslaved by the Irken Empire and currently the species works the Conveyor Belt Planet.
Scrin Command & Conquer
Sebaceans Farscape Humanoid. Genetically engineered off-shoot 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
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
Shoggoths H. P. Lovecraft
Sholans Lisanne Norman - Sholan Alliance Feline Humanoid
Shofixti Star Control
Shonunin C. J. Cherryh's Alliance-Union universe
Shroobs Mario & Luigi: Partners in Time
Silacoids X-COM: UFO Defense
Silicoids Master of Orion
Silfen Peter F. Hamilton's "Pandora's Star" Humanoid
Silver Surfer Marvel Comics
Sirians Serious Sam: The First Encounter
Skaarj Unreal (series)
Skedar Perfect Dark
Skinnies Starship Troopers Arachnoids
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
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 Each have thick southern accents.
Space Pirates Metroid series
Space Chickens Bravest Warriors Physiologically similar to pigeons.
Spathi Star Control
Species 8472 Star Trek
Spibbley Invader Zim
Spiridons Doctor Who
Spirits Stargate SG-1 Humanoid
Splixson Ben 10
S'pht Marathon Trilogy
Spoo Babylon 5
Squirps Super Paper Mario
Squiz-Quijy Utopia
Ssora Renegade Legion Reptilian
Strogg Quake II and Quake 4
Stsho C. J. Cherryh's Chanur novels
Stu Pixar's Lifted (2006 film)
Sugarbellies Bravest Warriors They speak in high-pitched voices.
Suliban Star Trek Humanoid
Sungs 2300 AD
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.
Supox Star Control
Serrakin Stargate SG-1 Humanoid
Swaparamans Ascendancy
Sycorax Doctor Who Humanoid
Sye-Men Battlelords of the 23rd Century
Sykarians Farscape Humanoid
Syreen Star Control Humanoid