Justice League #51

Synopsis

Six months after their first fight against Darkseid, the Justice League is introduced to Batman's associate Robin during a crisis. Amid a flurry of unusual occurrences, the League joins Superman in fighting giant mechanical dogs in Metropolis and is surprised by two more unexpected arrivals. Robin gives Cyborg and Green Lantern the suggestion that allows them to trace the visitors' journeys through cracks in space-time caused by shutting down Darkseid. Cyborg and Green Lantern send all home to their correct time and place and seal the cracks, while an observer takes special interest in Robin.