Bio: Agent Orange was originally a man claiming to have served in the Armed Forces who saw combat in the Vietnam War. He further claims that during that time he suffered some type of debilitating injury or ailment, and was bitter and resentful over how he was treated by both the military and the general public upon his return to the United States.
Deciding that the government had to pay for his mistreatment, he became Agent Orange, and, armed with a gun that fires napalm, began to commit a series of terrorist attacks in Gotham City. These attacks were to culminate with a massive final strike in which he and his followers would expose the entire city to toxic gas, killing thousands.
The attack was foiled by the Batman and his teammates in the Outsiders. Agent Orange was captured and sent to prison, and remains there to this day.