A Station Eight Fan Web Site
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http://www.s8.org/gargoyles/askgreg/search.php?qid=21667
"What makes you think Two-Face exists?"
There's a page on the YJ Wiki. http://youngjustice.wikia.com/wiki/Two-Face. He appeared in Young Justice: Face Your Fears and Christopher Jones confirmed Batman and Robin were in his lair.
I see. So nothing definitive. ;)