Slade Joseph Wilson codenamed Deathstroke by A.R.G.U.S., is a former member of the Australian Secret Intelligence Service/ASIS unit, and the former leader of the Church of Blood. He is also the former friend and ex-partner of the late Billy Wintergreen, the father of Joe Wilson, one of the former mentors and friend turned enemy of Oliver Queen, friend turned enemy of the late Sara Lance, and a good friend of the late Shado, who Slade was in love with despite her being Oliver's lover.
Wilson volunteered for a medical experiment designed to stimulate his adrenal gland in the hopes of increasing a soldier's ability to resist truth serums. The experiment did not go as expected, and Slade fell into a coma. When he awakened however, he discovered that he was now capable of using 90% of his brain capacity, and his strength, durability and agility were increased to near-superhuman levels. He applied for re-assignment with the Army, but they refused him. Although his condition was now stabilized, depression took hold of him and he was desperate to serve his country. Slade was not only a world famous safari hunter, he was also one of the world's deadliest and most highly sought after assassins - Deathstroke the Terminator.