Teen Titans has never been established explicitly to be a part of the larger DC Animated Universe or The Batman, a source of fan controversy. Indicating separation from the DC Animated Universe, series producer Bruce Timm stated the series would not cross over with Justice League Unlimited. There was a reference to the Teen Titans in one of the later episodes of Static Shock where Batman guest starred. The main character Virgil Hawkins asked Batman where Robin was, Batman answered " He's with the Titans." When Virgil asked who they were Batman replied " You'll meet them someday " In addition, Speedy, who first appeared in Teen Titans as a member of the tournament of heroes episode along with Aqualad and others, appeared alongside his mentor, Green Arrow, in Justice League Unlimited. Perhaps most notably, Kid Flash was voiced by Michael Rosenbaum in his appearances in the show - the same actor who voiced the Flash in Justice League Unlimited.