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Xindi-AquaticXindi-ArborealXindi-Avian
Xindi-InsectoidXindi-PrimateXindi-Reptilian
XirmisalaXivilaiXixtchil
XordaXornXoxian
XploderXulXulody
XxjrjxenianXylithXylok
Xynarch Charge-SuckerXyrillianXyronite
Y'bithYaarpYachi
YaderanYah-An-RaYahg
YahirYahk-ToshYaka
YalaranYalosianYam'rii
Yang (Lilo & Stitch)YangetheYanme'e
YapiYapping MawYard
YardratYardratianYargonian
YarickYarn PeopleYatir
YautjaYayaxYchthytonian
YeerkYehatYeki
YekokanYellow Alien (Deep Space Nine)Yellow Bulborb
Yellow DiamondYellow Light AliensYellow Pearl
Yellow PikminYellow SnakeYellow Wollywog
Yellow ZirconYerdua Poison-SpitterYeti
Yeti (FMM-UV 32)Yeti (Futurama)Yeti (Roswell Conspiracies)
YevaraYevethaYggardis
Yhhanak'ukul'lanjhYidrianYimi
Yin (Lilo & Stitch)YinchorriYinsect
Yip YipYirbekYirmak
YivoYlesian White WormYlymphe
YmaYmirYobshrimp
YodaYoda's speciesYodude
YogYog-SothothYokian
YoluYondarYondu Udonta
YootakYorYor (Lost Regiment)
YorgYorgraxxanYost's species
YrashuYridianYsalamir
YtheYturiYu'vath
YugamiYugopotamianYuht
YuliYultanYum
YumboYummeYupper
YuptarYuukaYuusho
Yuuzhan VongYuvernianYuzzem
YuzzumYvaremaZ'nid Bird
Z'valiZ-RonZ-Virus
Zab NeruZabrakZaela Tree
Zaela treeZaggerakZakdorn
ZakkegZalaacaZalkonian
ZaltianZamaronZamporiano
ZanZanganZangan (Aliens vs. Zombies)
ZangoidZanibarZanon
ZaoalenaZaragoatZaralok
ZaraniteZarathustra JellyfishZarbi
ZarbonZarbon's raceZareth
ZarglorpZargon SlugZarian
ZarkhatorZarkonZarolatt
ZarthanZaszZaw-Veenull
ZazabiZeHethbraZeb
ZebboZebesianZebesian Dragon
ZebralopeZebrankyZedam
ZeelaZeenuianZeffliffl
ZeiophZeiramZeke Martian
ZekuZelZelosian
ZeltronZenerZenetan
ZennanZenoxZentac
ZenterranZentraediZeolosian
ZeosianZergZerg Drone
Zerg Hive ClusterZerg LarvaZerg Overlord
Zerg SwarmZerglingZeta Reticulan (Starship Invasions)
ZetanZetarianZetton
ZexxZha'tilZiboson
Zick SlugZig and ZagZigerion
ZigraZiielZikoro
Zikoro's SpeciesZilkinZillo Beast
ZinZin (Vardian)Zin Empire
ZinariyaZingkalZinyak
ZirconZirdZirite
ZirkonianZirrZisian
ZistleZix, Travoltron, and TeeZizimaak
ZkrkrxsZllyphanZoa
ZoahZoatZodat
ZoffZojaZolander
Zolfa-ThuranZoltronZombarian
ZombieZombie (Half-Life)Zombie (Minecraft)
Zombie (Space Dandy)Zombie PigmenZombieman
Zonama SekotZone FighterZongorlu
ZoniZonianZonn
ZoolZoomerZooplantae
Zoq-Fot-PikZorZorg Industries
ZorgonZorgon's speciesZorgon (Zathura)
ZorgulonZoroZoron
ZudjariZuggiteZumakan
ZurokZuulZuurt
ZuyuaZybahhod YenyoniZycothian
ZygerrianZygianZygon
ZygoteZylonZylurian
ZyrgonianZyzzybalubah
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