Little after the death of his sister Isis, Osiris was approached by Deathstroke who claimed to have a way to bring his sister back to life. Naive and willing to believe anything Osiris agreed to join Deathstroke's Titan's East to defeat Captain Marvel Jr. in exchange for Deathstroke resurrecting Isis. When the Titan's East confronted the Teen Titan's Osiris managed to defeat Captain Marvel Jr. but that was soon followed by Wonderboy's arrival. After taking in Wonderboy's sincere word's he decided to betray Deathstroke and help Wonderboy defeat Dark Supergirl. In the end he returned to the Titan's team as a full time member