Live-action

• Caminhos do Coração a.k.a. Paths of the Heart (franchise):
  • Caminhos do Coração a.k.a. Paths of the Heart (2007–2008, Brazil)
  • Os Mutantes: Caminhos do Coração a.k.a. The Mutants: Pathways of the Heart (2008–2009, Brazil, spin-off)
• Cape, The (1996–1997)
• Cape, The (2011) (elements of science fiction)
• Caprica (2010)
• Captain Midnight (1954–1958)
• Captain Scarlet (franchise):
  • Captain Scarlet and the Mysterons (1967–1968, UK, puppetry)
  • Captain Scarlet vs the Mysterons (1980, Captain Scarlet and the Mysterons compilation, puppetry, film)
  • Revenge of the Mysterons from Mars (1981, Captain Scarlet and the Mysterons compilation, puppetry, film)
• Captain Video and His Video Rangers (1949–1955)
• Captain Vyom – The Sky Warrior (1998–1999, India)
• Captain Z-Ro (1951–1956)
• Captain Zep – Space Detective (1983–1984, UK)
• Cavemen (2007) (elements of science fiction)
• Century City (2004–2005)
• Century Falls (1993, UK)
• Chameleon (franchise):
  • Chameleon (1998, film)
  • Chameleon II: Death Match (1999, film)
  • Chameleon 3: Dark Angel (2000, film)
• Chameleons (1989, pilot)^[1] IMDb 
• Champions, The (1968–1969, UK)
• Changes, The (1975, UK)
• Charlie Jade (2005, Canada/South Africa)
• Children of the Dog Star (1984, New Zealand, miniseries)
• Children of the Stones (1977, UK, elements of science fiction)
• Chocky (1984–1985, UK)
• Chronicle, The (2001–2002) (elements of science fiction in some episodes)
• City Beneath the Sea (franchise):
  • Plateau of Fear (1961, UK)^[2] IMDb 
  • City Beneath the Sea (1962, UK, Plateau of Fear sequel)^[3] IMDb 
  • Secret Beneath the Sea (1963, UK, 1962 City Beneath the Sea sequel)^[4] IMDb 
  • City Beneath the Sea (1971, film, pilot)
• City Cat (1993, Yugoslavia, film)^[5]
• Clangers (1969–1974, UK)
• Cleopatra 2525 (2000–2001)
• Cliffhangers (1979)
• Clifton House Mystery, The (1978)
• Clone (2008, UK)
• Code 404 (2020–2022, UK)
• Code Name: Eternity (1999–2000, Canada)
• Codename Icarus (1981)
• Collector, The a.k.a. Sakupljac (2005–2006, Serbia, anthology)
• Colony (2015-2018)
• Come Back Mrs. Noah (1977–1978, UK)
• Commando Cody: Sky Marshall of the Universe (1955)
• Continuum (2012–2015, Canada)
• Counterpart (2017-2019)
• Counterstrike (1969, UK)
• Cowboy Bebop (2021)
• Crash – Truslen fra det sorte hul a.k.a. Crash – The Menace from the Black Hole (1984, Denmark)
• Crime Traveller (1997, UK)
• Crossing, The (2018)
• Cybergirl (2001–2002, Australia)
• Cybersix (1995, Argentina)

Animated

• C.O.P.S. (1988, animated)
• Cadillacs and Dinosaurs (1993–1994, animated)
• Captain Earth (2014, Japan, animated)
• Captain Future a.k.a. Capitaine Flam (France), a.k.a. Capitan Futuro (Italy), a.k.a. Capitán Futuro (Spain/Latin America), a.k.a. Knight of Space, The (Arabic) (1978–1979, Japan, animated)
• Captain Harlock (franchise):
  • Space Pirate Captain Harlock (1978–1979, Japan, animated)
  • Galaxy Express 999 (1978–1981, Japan, animated)
  • Space Symphony Maetel (2004–2005, Japan, Galaxy Express 999 sequel, animated)
  • Space Pirate Captain Herlock: The Endless Odyssey (2002, Japan, animated)
  • Harlock Saga (1998–1999, Japan, animated)
  • Arcadia of My Youth: Endless Orbit SSX (1982–1983, Japan, animated)
  • Queen Emeraldas (1998–1999, Japan, animated)
  • Captain Harlock and the Queen of a Thousand Years (1985–1986, US/Japan, animated)
  • Queen Millennia (1981–1982, Japan, animated)
• Captain Planet and the Planeteers (1993–1996, animated)
• Captain Power and the Soldiers of the Future (1987–1988, Canada/US, partly animated)
• Captain Scarlet (franchise):
  • New Captain Scarlet (2005, UK, animated)
• Captain Simian & the Space Monkeys (1996–1997, animated)
• Captain Star (1997–1998, UK/Canada/Spain, animated)
• Cars Toons: Mater's Tall Tales (2008–2012, animated) (elements of science fiction in the Unidentified Flying Mater episode)
• Casshern (franchise):
  • Casshern Sins (2008–2009, Japan, animated, Neo-Human Casshern reboot)
  • Neo-Human Casshern (1973–1974, Japan, animated)
• Centurions, The (1985–1987, animated)
• Chargeman Ken! (1973, Japan, animated)
• Chō Kōsoku Galvion (1984, Japan, animated)
• Chobits (2002, Japan, animated)
• Chōdenji Machine Voltes V (1977–1978, Japan, animated)
• Chōdenji Robo Combattler V (1976–1977, Japan, animated)
• Chojin Sentai Barattack (1977–1978, Japan, animated)
• Chrome Shelled Regios (2009, Japan, animated)
• Cleopatra in Space (2019-current, animated)
• Cobra (franchise):
  • Space Cobra (1982–1983, Japan, animated)
  • Cobra the Animation: Rokunin no Yushi (2010, Japan, animated)
• Code-E (franchise):
  • Code-E (2007, Japan, animated)
  • Mission-E (2008, Japan, animated)
• Code Geass (franchise):
  • Code Geass: Lelouch of the Rebellion a.k.a. Code Geass (2006–2007, Japan, animated)
  • Code Geass: Lelouch of the Rebellion R2 (2008, Japan, animated)
• Code Lyoko (franchise):
  • Garage Kids (2001, France/US, Code Lyoko pilot, animated)
  • Code Lyoko (2003–2007, France, animated)
  • Code Lyoko: Evolution (2012–2013, France, partly animated)
• Colonel Bleep (1957–1960, United States, animated)
• Combat Mecha Xabungle (1982–1983, Japan, animated)
• Coppelion (2013, Japan, animated)
• Cosmic Quantum Ray (2009, Germany, animated)
• Cosmo Warrior Zero (2001, Japan, animated)
• Courage the Cowardly Dog (1999–2002, animated) (elements of science fiction in some episodes)
• Cowboy Bebop (1998–1999, Japan, animated)
• Coyote Ragtime Show (2006, Japan, animated)
• Crest of the Stars Trilogy (franchise):
  • Crest of the Stars (1999, Japan, animated)
  • Banner of the Stars (2001, Japan, animated)
  • Banner of the Stars II (2001, Japan, animated)
• Cubix (2001–2003, South Korea, animated) a.k.a. Cubix: Robots for Everyone (US)
• Cybersix (1999, Canada/Argentina, animated)
• Cyborg 009 (franchise):
  • Cyborg 009 (1968, Japan, animated)
  • Cyborg 009 (1979–1980, Japan, animated)
  • Cyborg 009 (2001–2002, Japan, animated)