Series with the first letter - "X"

• X Company (2015–2017)
• X-Men (2011–…)
• X-Men: Evolution (2000–2003)
• X-Men: The Animated Series (1992–1997)
• Xavier Riddle and the Secret Museum (2019–…)
• Xena: Warrior Princess (1995–2001)
• XIII: The Series (2011–…)