List of fictional alien species: Z

Name	Source	Type
Zabrak	Star Wars	Alternative name for the humanoid Iridonian race whose most distinctive feature is the array of small horns on top of their heads. Their home planet is Iridonia, though they have established many colonies on planets throughout the galaxy. The most well known member is Darth Maul.
Zakdorns	Star Trek	The Zakdorn are a race native to the Alpha or Beta Quadrant. Zakdorn are humanoids with pouches of thick, fibrous tissue on their cheeks. They have three pouches per cheek.
Zaldans	Star Trek
Zalkonians	Star Trek
Zarbi	Doctor Who
Zebesians	Metroid series
Zen Rigeln	Battlelords of the 23rd Century	Humanoid
Zen-Whoberis	Marvel Comics	Humanoid
Zenetan	Farscape	Humanoid
Zenn-Lavians	Marvel Comics	Humanoid
Zentradi	Macross, adapted as the Zentraedi in Robotech	Humanoid
Zerg	StarCraft
Zhodani	Traveller RPG
Zin	Saints Row
Zinoboppian	Melonpool
Zirkonian	Aliens in the Attic
Zisuili	Harry Turtledove's Worldwar series	A large stock animal native to Home and used by the Race as a foodstuff. Zisuili meat is also edible to humans. The Colonization Fleet brought zisuili and several other species of livestock to Tosev 3. As Earth plants were not equipped to deal with the extremely economic grazing patterns of these animals, some ecological damage resulted. This in turn led to diplomatic tensions between the Race the various human powers.
Zog	Renegade Legion	Humanoid
Zoni	Ratchet & Clank	Extradimensional energy-creatures. Can manipulate space and time. Have a hivemind, except for their leader, Orvus. Constructed and maintain the Great Clock.
Zoq-Fot-Pik	Star Control
Zorgons	Sluggy Freelance
Zorgons	Zathura	Cold-blooded reptiles that seek heat and matter to burn.
Zygons	Doctor Who	Shape-shifting humanoid