List of fictional alien species: C

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Name	Source	Type
Caitian	Star Trek: The Animated Series	Feline humanoid
Calamarain	Star Trek
Caleban	Frank Herbert's Whipping Star	invisible telepathic beings who are actually the minds of stars
Calcinite	X-COM: Terror from the Deep
Callineans	Star Fleet	Humanoid
Caliban	C. J. Cherryh's Alliance-Union universe
Capelons	Ascendancy
Conductoid	Ben 10:Omniverse
Cardassian	Star Trek	Reptilian Humanoid
	Star Trek	Reptilian Humanoid
Carggites	DC Comics Legion of Super-Heroes
Carrionites	Doctor Who	Humanoid
Cat	Red Dwarf	Felis Sapiens. Evolved over the course of three million years in deep space, from a domesticated housecat.
Catbug	Bravest Warriors	A combination part cat and part ladybug, Catbug simultaneously exists in two dimensions; reality and the See-Through Zone.
Cathar	Star Wars	Cat-like humanoid
Catkind	Doctor Who	Feline Humanoid.
Cat People	Marvel Comics	Feline humanoid
Catalyte	Utopia
Catteni	Anne McCaffrey's Catteni Series
Cavalier	Tommy & PJ
Cazare	Ratchet & Clank
Celareon	Conquest: Frontier Wars
Celatid	X-COM: UFO Defense
Celestials	Marvel Comics
Celestialsapien	Ben 10
Centauri	Babylon 5	Humanoid
Centrans	Christopher Anvil's Pandora's Planet stories	Feline humanoids
Cerebrocrustacians	Ben 10	Crab like aliens
Ceti eel	Star Trek II: The Wrath of Khan	bug-like ear parasites from Ceti Alpha V
Chaethe	Kathy Tyers's One Mind's Eye
Chalnoth	Star Trek
Chamachies	Ascendancy
Changeling	Star Trek
Chaos	Independence War, aka I-War, and Independence War 2: Edge of Chaos
Charrids	Farscape	Humanoid
Chasch	Jack Vance's Planet of Adventure Series	Big headed humnoids divided in subspecies.
Chatilian	Battlelords of the 23rd Century	Humanoid
Cheblons	Imperium Galactica II: Alliances
Cheela	Dragon's Egg	inhabitants of neutron star
Chelonians	Doctor Who novels
Chenjesu	Star Control	Crystalline life-form
Cherubs	Homestuck	Cherubs are characterized by their green exoskeleton.
Chevanno	Utopia
Chi	C. J. Cherryh's Chanur novels
Chigs	Space: Above and Beyond
Chimera	Resistance: Fall of Man	Reptilian Hybrids between virus and host
Chimera Sui Generis	Ben 10
Chinger	Bill, the Galactic Hero
Chiss	Star Wars	Blue-skinned red-eyed humanoids
Chmmr	Star Control
Cho-choi	Jack McDevitt's Infinity Beach
Chozo	Metroid	Bird-like species. Extremely technologically advanced and spread out across the galaxy.
Chronian	Ben 10: Race Against Time	Looks just like a human. They have vast Time manipulation powers and able to create Energy beams.
Chronomyst	Ascendancy
Chryssalid	X-COM: UFO Defense
Cinnrusskin	James White's Sector General series
Cirronians	Tracker
Cizerack	Battlelords of the 23rd Century
Clairconctlar	Star Control 3
Clutch Turtles	Liaden universe
Cocytans	The Dig	Furry, bird-like beings trapped in "Spacetime Six", a parallel universe.
Coeurl	The Voyage of the Space Beagle by A. E. van Vogt	Similar to a big cat; prehensile tentacles sprouting from shoulders. Feeds on potassium and/or organic phosphorus.
Cognocenti	Star Trek
Colatas	Farscape	Humanoid
Cole	Tracker
Colonists	The X-Files
Colour out of space	H. P. Lovecraft
Coluans	DC Comics Legion of Super-Heroes
Combine	Half-Life 2	an alien empire; note: many of the "Combine" seen in the game are actually humans that have been assimilated or collaborate as brutal police troopers.
Coneheads	Saturday Night Live	Humanoid with conical heads
Control Brains	Invader Zim	The Control Brains assign the Irken race with roles and are the unspoken leaders of the Irken Empire.
Coola (Cooler)	Dragon Ball Z	Humanoid; Reptilian
Coreeshi	Farscape	Humanoid
Coridanite	Star Trek	Humanoid
Corporal Giroro	Sgt. Frog
Corvallen	Star Trek	Reptilian Humanoid
Cosmo the Seedrian	Sonic X	Human Plant
Covenant, The	Halo	Collective of alien species who are allied with each other, Composed of Grunts, Brutes, Elites, Hunters, Jackals, and Prophets. Religious Hierarchy with intent to destroy the Human Race.
Cranassians	Raiden	Hi-tech aliens that has control over red crystals with unlimited powers, which are used to power up their weapons and equipment.
Cragmite	Ratchet & Clank
Creators	Nexus: The Jupiter Incident
Crites	Critters films	carnivorous hairballs
Cryons	Doctor Who	Humanoid
Ctarl-Ctarl	Outlaw Star
Cthulhi	Cthulhu Mythos
Cthulhu	Cthulhu Mythos
Cybermen	Doctor Who	Marauding cybernetic life-forms. Originally an alien race driven to conversion by catastrophic climate change, more recently reimagined as assimilated humans.
Cybertronian	Transformers	Large robots able to change their shape at will into other mechanical constructs. Known more commonly as Transformers.
Cybyota	Orion's Arm
Cyclons	Metroid series
Cylons	Battlestar Galactica	Sentient robots. Remnants of a civilization of reptilian aliens (also known as Cylons) in the original series, but created by humans in the remake series. Both mechanical and biological flesh-and-blood versions co-exist, with the biological versions in charge.
Cynoid	Master of Orion III
Cyrollan	The Journeyman Project