Slade Wilson also known as Deathstroke is a member of The ASIS, also known as Australian Secret Intelligence Service. He, along with his partner Billy Wintergreen, were sent to Lian Yu to rescue Yao Fei and free him from The Island Prison. Both he and his partner wear a mask to protect their identities during their missions; while wearing the masks they are known only by the name Deathstroke. At some point during his and Billy Wintergreen's time on Lian Yu some event occurred which caused them to sever ties and stop working together, and Billy Wintergreen eventually joins and began working for Edward Fyers and his team on The Island Prison.