Titans / Young Justice: Graduation Day #2 (2003)

Part Two: Commencement
The Titans and Young Justice have taken a beating at the hands of the supposedly non-hostile robotic life-form they encountered. Medical personnel and Sarah Charles work to keep them stable, and the unharmed members of both teams question their decisions and their heroic role. They then learn that the life-form is at a S.T.A.R. facility, having caused major collateral damage there. Superman is also on the scene, but appears to be doing nothing. Those heroes still standing make their way there and watch, horrified as Superman casually snaps Omen's neck - it's a Superman robot, all of which had been thought deactivated.
Release Date: 2003