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Xindi-AquaticXindi-ArborealXindi-Avian
Xindi-InsectoidXindi-PrimateXindi-Reptilian
XiotalXirmisalaXivilai
XixtchilXonXorda
XornXoxianXploder
XulXulodyXxjrjxenian
XylithXylokXynarch Charge-Sucker
XyrillianXyroniteY'Lyntian
Y'bithYaarpYachi
YaddithianYaderanYah-An-Ra
YahgYahk-ToshYaka
YalaranYalbecYalosian
Yam'riiYang (Lilo & Stitch)Yangethe
Yanme'eYapiYapping Maw
YardYardratianYargonian
YarickYarn PeopleYasto Attsmun
YatirYautjaYayax
YchthytonianYdheemYeerk
YehatYekiYekokan
YekubianYellow Alien (Deep Space Nine)Yellow Bulborb
Yellow Light AliensYellow PikminYellow Snake
Yellow WollywogYerdua Poison-SpitterYeti
Yeti (FMM-UV 32)Yeti (Futurama)Yeti (Ribbitking)
Yeti (Roswell Conspiracies)YevaraYevetha
YggardisYhhanak'ukul'lanjhYhoundeh
YidrianYimiYin (Lilo & Stitch)
YinchorriYinsectYip Yip
YirbekYirmakYivo
Ylesian White WormYlympheYma
YmirYobshrimpYoda's species
YodudeYogYog-Sothoth
YokianYoluYondar
YootakYorYor (The Lost Regiment)
YorgYorgraxxanYorhi
Yost's speciesYrashuYridian
YsalamirYtheYturi
Yu'vathYugamiYugopotamian
YuhtYuliYultan
YumYumboYumme
YupperYuptarYuuka
YuushoYuuzhan VongYuvernian
YuzzemYuzzumYvarema
Z'nid BirdZ'valiZ-Ron
Z-VirusZabrakZadoran
Zaela TreeZaela treeZaggerak
ZakdornZakkegZalaaca
ZalkonianZaltianZamaron
ZamporianoZanZandir Flower
ZanganZangan (Aliens vs. Zombies)Zangarian
ZangoidZanibarZanon
ZaoalenaZaragoatZaralok
ZaraniteZarathustra JellyfishZarbi
Zarbon's raceZarglorpZargon Slug
ZarianZarkhatorZaroffian
ZarolattZarthanZask
ZatonZazabiZbornak
ZeHethbraZebZebbo
ZebesianZebesian DragonZebralope
ZebrankyZedamZeela
ZeenuianZeevanian ApeZeex
ZefflifflZeiophZeiram
Zeke MartianZekuZel
ZelosianZeltronZener
ZenetanZennanZenox
ZentacZenterranZentraedi
ZeolosianZeosianZerg
Zerg DroneZerg Hive ClusterZerg Larva
Zerg OverlordZerg SwarmZergling
Zeta Reticulan (Starship Invasions)ZetanZetarian
ZettonZexxZha'til
ZibosonZick SlugZig and Zag
ZigerionZigraZikoro's Species
ZilkinZillo BeastZin
Zin EmpireZinariyaZingkal
ZinyakZirdZirite
ZirkonianZirrZisian
ZistleZix, Travoltron, and TeeZizimaak
ZkrkrxsZllyphanZoa
ZoahZoatZodat
ZoffZojaZolander
Zolfa-ThuranZoltronZombarian
ZombieZombie (Half-Life)Zombie (Minecraft)
Zombie (Space Dandy)Zombie PigmanZonama Sekot
Zone FighterZongorluZoni
ZonianZonnZool
ZoomerZooplantaeZoq-Fot-Pik
ZorZorg IndustriesZorgon
Zorgon's speciesZorgon (Zathura)Zorgulon
ZoroZoronZuben'ubian Leech
ZudjariZuggiteZumakan
ZurokZuulZuurt
ZuyuaZybahhod YenyoniZycothian
ZygerrianZygianZygo
ZygonZygoteZylon
ZylurianZyrgonianZyzzybalubah
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