User blog comment:ScoobycoolDoo/Who's the mole?/@comment-3061966-20111122031456

It's probably Artemis, but unknowingly. And she'll probably betray them against her will. With her ties to Cheshire; the latter being rather shady, the chances are moderately high. Well, that's just my take.

Though Superboy could have some program implanted in his head for all we know.