15 Batman Arkham Series Elements That Would Make Future Films Great

Deathstroke makes a surprise return to the Arkham series towards the end of Arkham Knight, where he assumes control of the Knight's militia following his disappearance. His time on screen is short-lived and sadly, in contrast to the excellent fight sequence that he and Batman share in Origins, his downfall is something of an anticlimax. 

Regardless of this, his interactions with his adversary are excellent, particularly his revelation that he took the job as Scarecrow's backup should the Knight fail upon hearing that Batman considered him one of the toughest adversaries he has ever faced.

Deathstroke has been seen on screen recently as an adversary to Oliver Queen on the television series Arrow, but first appeared in comics as an opponent for the Teen Titans as Deathstroke the Terminator, before the latter part of his name was dropped (blame James Cameron) and he gradually became renowned as one of the DC universe's deadliest mercenaries.

Otherwise known as Slade Wilson (not to be confused with Marvel's Wade Wilson, otherwise known as Deadpool, who was seen as suspiciously similar to his DC counterpart before being re-imagined as the smart-talking fourth wall breaking antihero that we now know), Deathstroke is truly a fascinating character. 

As a result, it's surprising that he has never been considered for inclusion in a film before now. The dynamic between him and the Dark Knight, which sees them mutually respect each other's abilities but nevertheless strive to take the other down, would come out well on camera, particularly if Deathstroke's campaign becomes more and more personal despite his proclamations that he is only a professional that doesn't care who Batman is under the mask.