This Monday, Ben Affleck - who lately has his hands full with the DC Extended Universe - shared some footage on his Twitter account of what looks to be the popular villain Deathstroke. The nearly thirty second clip shows an actor in a costume reminiscent of the character who was originally introduced in Teen Titans in the '80s, and also can be seen in the CW's 'Arrow.' Fans are speculating that Deathstroke will likely appear in the Justice League movie.