User blog comment:Eobard95/OK NOW I'M CONVINCED PROMETHEUS AND HELIX ARE IN LEAGUE!/@comment-27673963-20170428130114/@comment-27700324-20170429032003

If you don't even know, then it is not a good theory. Also Arrow has stopped with the Batman thing for a while now. Only characters that are specifically Batman characters are Ra's and Firefly. The rest have fought Oliver Queen as well as Batman.

I personally believed that it was 1990's TV show Flash in the Iron Mask.