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List of fictional alien species: Y

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Name Source Type
Yacatisma Church of the SubGenius
Yag-Kosha Robert E. Howard's The Tower of the Elephant Humanoid elephant
Yanme'e Halo
Yautja Predator Humanoid. Also known as Predators. They are a warrior race that hunts down other sentient races for sport, but follow a code of honor and deeply respect those who manage to defeat one of their own in combat.
Yazirian Star Frontiers Ape-like humanoid glider
Yeerks K. A. Applegate's Animorphs Slug-like parasites. They need a host to see, walk, and communicate, and are the main antagonists of the Animorphs series, intent on enslaving other species.
Yehat Star Control Pterodactyl-like
Yeti Doctor Who
Yilane West of Eden series by Harry Harrison
Yip-Yips Sesame Street
Yliis 2300 AD
Yolkians Jimmy Neutron Gooey Slug-like aliens with egg shaped suits.
Yomingans Schlock Mercenary
Yor Galactic Civilizations
Yorn Star Control 3
Ythrian Poul Anderson's Technic History Eagle-like aliens
Yridian Star Trek
Yugopotamians The Fairly OddParents Squid-like aliens with dome-covered brains.
Yuuzhan Vong Star Wars Humanoid