- Xenodenial
- Xenofungus
- Xenomorph
- Xenomorph Dog
- Xenophage
- Xenopsyllian
- Xenu
- Xenusian
- Xepolite
- Xeraphin
- Xerge
- Xeron
- Xeronian Gut-guzzler
- Xers
- Xerxes IV Amazon
- Xevon
- Xexto
- Xhiatyr
- Xi
- Xi'Dec
- Xi Bootean
- Xi Charrian
- Xiaan Amersu
- Xiclotlan
- Xilien
- Xilurian
- Ximegan
- Xindi
- Xindi-Aquatic
- Xindi-Arboreal
- Xindi-Avian
- Xindi-Insectoid
- Xindi-Primate
- Xindi-Reptilian
- Xiotal
- Xirmisala
- Xivilai
- Xixtchil
- Xolotlite
- Xon
- Xorda
- Xorn
- Xorrian
- Xoxian
- Xploder
- Xressian
- Xudarian
- Xul
- Xulody
- Xxjrjxenian
- Xybrian
- Xygal
- Xylith
- Xylok
- Xynarch Charge-Sucker
- Xyrillian
- Xyronite
- Y'Lyntian
- Y'bith
- Y'golonac
- Y.E.T.I.
- Yaa Iram
- Yaag
- Yaarp
- Yachi
- Yaddithian
- Yaderan
- Yag
- Yagop
- Yah-An-Ra
- Yahg
- Yahk-Tosh
- Yaka
- Yalaran
- Yalbec
- Yalcan
- Yalmor
- Yalosian
- Yam'rii
- Yang (Lilo & Stitch)
- Yangethe
- Yanme'e
- Yapi
- Yapping Maw
- Yard
- Yardratian
- Yargonian
- Yarick
- Yarkdao
- Yarkora
- Yarmari
- Yarn Person
- Yasto Attsmun
- Yatir
- Yautja
- Yayax
- Ychthytonian
- Ydheem
- Yedda
- Yeerk
- Yehat
- Yeki
- Yekokan
- Yekubian
- Yellow Alien (Deep Space Nine)
- Yellow Bulborb
- Yellow Crest
- Yellow Light Aliens
- Yellow Martian (DC)
- Yellow Pikmin
- Yellow Slime
- Yellow Snake
- Yellow Spectralid
- Yellow Wollywog
- Yerdua Poison-Spitter
- Yeti
- Yeti (FMM-UV 32)
- Yeti (Futurama)
- Yeti (Ribbit King)
- Yeti (Roswell Conspiracies)
- Yevara
- Yevetha
- Yggardis
- Yhemyr Voidshoal
- Yhhanak'ukul'lanjh
- Yhoundeh
- Yidrian
- Yill
- Yimi
- Yin (Lilo & Stitch)
- Yinchorri
- Yinsect
- Yip Yip
- Yirbek
- Yirmak
- Yith
- Yivo
- Ylesian White Worm
- Ylymphe
- Yma
- Ymir
- Yobcrab
- Yobshrimp
- Yoda's species
- Yodude
- Yog
- Yog-Sothoth
- Yokian
- Yokoth
- Yolog
- Yolu
- Yomo Yeast
- Yondar
- Yonhet
- Yootak
- Yor
- Yor (The Lost Regiment)
- Yorg
- Yorgraxxan
- Yorhi
- Yost's species
- Yrashu
- Yridian
- Ysalamir
- Ythe
- Yturi
- Yu'vath
- Yugami
- Yugg
- Yuggothian
- Yugopotamian
- Yuht
- Yuli
- Yultan
- Yum
- Yumbo
- Yumme
- Yupper
- Yuptar
- Yuuka
- Yuukou's Species
- Yuusho
- Yuuzhan Vong
- Yuvernian
- Yuzzem
- Yuzzum
- Yvarema
- Z'nid Bird
- Z'vali
- Z-Ron
- Z-Virus
- Zabmorph
- Zabrak
- Zadoran
- Zaela Tree
- Zaela tree
- Zaggerak
- Zakdorn
- Zakirian
- Zakkeg
- Zakpap
- Zalaaca
- Zalkonian
- Zaltian
- Zamaron
- Zamporian
- Zan
- Zanan
- Zandir Flower
- Zangan
- Zangan (Aliens vs. Zombies)
- Zangarian
- Zangoid
- Zanibar
- Zanifarian Death Weasel
- Zankon
- Zanon
- Zantoran
- Zaoalena
- Zaragoat
- Zaralok
- Zaranite
- Zaratan
- Zarathustra Jellyfish
- Zarbi
- Zarbon's race
- Zarg
- Zarglorp
- Zargon Slug
- Zarian
- Zark
- Zarkhas-Twapoov-Khon
- Zarkhator
- Zarkonian
- Zarniwoop
- Zaroffian
- Zarolatt
- Zaron
- Zarthan
- Zask
- Zatarian
- Zaton
- Zazabi
- Zbornak
- ZeHethbra
- Zeb
- Zebbo
- Zebesian
- Zebesian Dragon
- Zebra Goat
- Zebralope
- Zebranky
- Zebulghan
- Zedam
- Zeela
- Zeenuian
- Zeenuian Sorcerer
- Zeeter
- Zeevanian Ape
- Zeex
- Zeffliffl
- Zeffo
- Zeioph
- Zeiram
- Zeke Martian
- Zeku
- Zel
- Zelosian
- Zeltron
- Zen-Whoberis
- Zener
- Zenetan
- Zenn-Lavian
- Zennan
- Zenox
- Zenshin's Species
- Zentac
- Zenterran
- Zentraedi
- Zeolosian
- Zeosian
- Zephon's species
- Zerg
- Zerg Drone
- Zerg Hive Cluster
- Zerg Larva
- Zerg Overlord
- Zerg Swarm
- Zergling
- Zeron
- Zertonian
- Zeta Reticulan (Starship Invasions)
- Zetan (Fallout)
- Zetan (Lost in Space)
- Zetarian
- Zeti
- Zetian
- Zetoxian
- Zetton
- Zeus (Rick and Morty)
- Zexx
- Zha'til
- Zhaktari
- Zick Slug
- Zidgel
- Zig and Zag
- Zigerion
- Zigra
- Zik
- Zikich
- Zikoro
- Zilkin
- Zillo Beast
- Zin
- Zinariya
- Zingkal
- Zip Zap's species
- Zircalonian
- Zirconian
- Zird
- Zirite
- Zirkonian
- Zirr
- Zirrelian
- Zirrelian Jellyworm
- Zisian
- Zistle
- Zix, Travoltron, and Tee
- Zizimaak
- Zkrkrxs
- Zllyphan
- Zlutt
- Znydgi
- Zoa
- Zoa (The Dark Crystal)
- Zoah
- Zoat
- Zocci
- Zodat
- Zodin
- Zoff
- Zoja
- Zolander
- Zolfa-Thuran
- Zolten
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