| Name |
Source |
Type
|
| X-ists |
Church of the SubGenius |
|
| X-Nauts |
Paper Mario: The Thousand-Year Door |
|
| X Parasites |
Metroid Fusion |
|
| Xandarians |
Marvel Comics |
Humanoid
|
| Xanthuans |
DC Comics' Legion of Super-Heroes |
|
| Xarians |
Battlelords of the 23rd Century |
|
| Xarquids |
X-COM: Terror from the Deep |
|
| Xchagger |
Star Control |
|
| Xeelee |
Xeelee Sequence novels |
an enigmatic and supremely powerful Kardashev Type V alien civilization
|
| Xel'Naga |
StarCraft |
An ancient race that created the Zerg and Protoss.
|
| Xenexian |
Star Trek |
|
| Xenomorphs |
Alien movies |
Parasitic
|
| Xenu |
Scientology |
|
| Xiangs |
2300 AD |
|
| Xiao Fengqing |
Legend of Heavenly Tear: Phoenix Warriors |
Humanoid
|
| Xilians |
Invasion of Astro-Monster and Godzilla: Final Wars |
Humanoid
|
| Xindi |
Star Trek |
Humanoid
|
| Xorda |
Sonic the Hedgehog comics |
|
| Xxcha |
Twilight Imperium |
Peaceful arboreal testudinoids
|
| Xyrillian |
Star Trek |
|