Genghis Khan was the founder and ruler of the Mongol Empire, the largest contiguous empire in history. His story and reputation have continued to interest modern audiences, and he's been featured as a character in numerous works of fiction:
Knight Rider: In the 1984 episode Genghis Car, Michael Knight and his robotic car, KITT, must team up once again—this time to defeat a time-traveling Genghis Khan. The episode presents the classic conflict between man and nature: the car-bound Knight must pursue the wily Khan, who is on horseback, through the mountains of Virginia. At the episode's conclusion, Knight believes he has tricked Khan into walking into the Time Trap, but the audience knows that Khan's soul has merely been downloaded into a robot car of his own.
Arthur: This animated children's show featuring a talking nerd/aardvark aired a six-week story arc about a new kid in school, Genghis Cat (voiced by Ken Watanabe), who begins eating the hearts of his enemies and taking over the school district. Eventually, Genghis Cat learns the importance of sharing, but not before being killed in battle by a combination of hubris and arrows.
2005 Major League Baseball All-Star Game: After receiving a majority of votes, Genghis Khan was exhumed, reanimated, and sent to Michigan to start for the National League. He was booed after his joints fell apart during the Home Run Derby.