Guest characters are a fact of modern fighting games, and we may have learned the first candidate for a Mortal Kombat 11 crossover slot. Spawn creator, publisher, and soon-to-be movie director, Todd McFarlane, has told a Reddit AMA he believes his creation is "on his way" to the 2019 release.

They're the hotly anticipated four-in-one special combo that concludes Injustice 2's Fighter Pack 3! The Teenage Mutant Ninja Turtles are finally here in the new gameplay trailer!

Lightning never strikes twice, but thanks to Injustice 2 Mobile it can strike wherever you want if you've unlocked Raiden!

Injustice 2 continues to grow thanks to Fighter Pack 2 and the latest addition of not one - but two new characters! You've already seen them in action in the exciting introduction trailer -- now take a closer look at Raiden and Black Lightning by clicking to enlarge these high quality images supplied by Warner Brothers and NetherRealm Studios!

Mortal Kombat's God of Thunder is the next cab off the Fighter Pack 2 rank! An electrifying new trailer shows Raiden delivering shock and awe to the villains of Injustice 2 -- and he isn't coming alone! Watch:

He wears a dirty brown hat, he's horribly burned, he has razors on his right hand. America's favourite bastard son of a hundred maniacs is back! Freddy Krueger has the brains, but you've got the Mortal Kombat X Mobile free-to-play challenge! Don't sleep - play with power to unlock him now!

The search for the perfect guest character is an art of balancing license availability, and the will to create a suitable game version. NetherRealm Studios may seem indiscriminate in their ever expanding collection of crossover fighters, but as Ed Boon told Gameinformer in a recent interview, the vetting process sees many characters disqualified.

As speculation over Mortal Kombat X's content future defiantly simmers post-MKXL; GameInformer have tapped into the always engaging, often contentious subject of guest characters - past, present and future.

Ed Boon revealed the best selling downloadable characters of the most recent game were Alien and Predator. It follows a trend started by Freddy Kreuger and Scorpion, who topped DLC sales in Mortal Kombat (2011) and Injustice: Gods Among Us respectively.

Mortal Kombat X featured the most downloadable characters of any NetherRealm Studios fighting game to date: eight in total. Four of those were guest fighters, meaning the combative Alien vs Predator mega-franchise trumped classic horror icons Jason Voorhees (Friday the 13th) and Leatherface (Texas Chainsaw Massacre) in latest sales. That fact hasn't stopped Ed Boon being open to the idea of a dedicated horror fighting game [full story].

The super-sized, all-in-one Mortal Kombat XL experience is officially out now! 2015's best selling fighting game gets the komplete edition treatment, jamming in all-new extras including Kombat Pack 2 fighters, Stage Fatalities, and Apocalypse Skins!

In mere hours NetherRealm Studios will offer a glimpse at Texas Chainsaw Massacre guest character Leatherface during the next Kombat Kast live stream. The developer demo begins at 4:00PM CST on Twitch, embedded below: