Todd McFarlane, the creator of Spawn, has approved the character’s appearance in Mortal Kombat X.
McFarlane has given developer NetherRealm Studios a specific window of time in which to use the comic book character. This would not be Spawn’s first appearance in a fighting game, as he was a playable character in Soulcalibur 2. However, this doesn’t mean that Spawn is a definite inclusion for Mortal Kombat X.
McFarlane also wants to expand on Spawn and increase his popularity. He has plans to grow the Spawn property in the future with TV and movies. With this kind of exposure, we could see the character become quite popular (again) and be added into more video games.