This issue is part of the
Zero Hour tie-ins group. It takes us back to a really controversial time in the history of DC; the fall of Hal Jordan and the rise of Kyle Rayner. At couple of weeks (or days) after Kyle received the ring, he went to Metropolis. Suddenly the dome covers the city and finds himself trapped inside and his ring without power. Jordan was also in Metropolis and once he losses his power, his feelings of guild comes crawling back.
