In the sewers under Sector 7, at the time of Cloud's collapse…
Zack is walking through the dank constrictive tunnels of the sewer with hate burning like a hot coal in his brain. He knows he had been given a second chance to destroy his enemy, the traitor Cloud Strife, and he intends to do just that. He was not going for the full on attack approach, oh no. Commander Reno had taught him well since his childhood and the Shin-ra was the only family he had ever known. He knew that he could strike hardest by removing the resistance, Cloud's loyal followers. He knew that without them his enemy's reign of evil would be over and the glorious Shin-ra could retake control and lead these savages to peace. He pulled on a Latex mask complete with wig and stopping before the entrance grate picked up a broken mirror and dusted of the grime. He looked at himself and began to laugh in a sinister fashion. For there, reflected in the glass, was the exact face of Cloud Strife…
