This is an inclusive list of science fiction television programs whose names begin with the letter X.

X Live-action X-Files, The (franchise) (elements of science fiction in some episodes): X-Files, The (1993–2002, 2016-2018) Lone Gunmen, The (2001, X-Files, The spin-off) Xcalibur (2001)

Animation X-Bomber (1980–1981, Japan, puppet animation) X-Men (franchise): X-Men: Pryde of the X-Men (1989, animated, pilot) X-Men aka X-Men: The Animated Series (1992–1997, animated) X-Men: Evolution (2000–2003, animated) Wolverine and the X-Men (2008–2009, animated) Marvel Anime: Wolverine (2011, Japan, animated) Marvel Anime: X-Men (2011, Japan, animated) Xenosaga: The Animation (2005, Japan, animated) The X's (2005, animated) Xyber 9: New Dawn (1999, animated)

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