John and his father Bill were examining the crash site of a Kree space probe. When they approached, the ship defense systems activated and a robot was dispatched. Bill sent out a distress call that was picked up by A-Next. They came and battled with the robot and John went aboard the ship to try to shut the robot down. However when he touched the console a surge of energy struck him and altered his DNA to be similar to a Kree's. It also clad him in a green and white costume. Using his new powers he went on to defeat the robot and claimed he would become the, "Earth Sentry" to protect the world from wrong doings.