From Wikipedia, the free encyclopedia.  Nathan Stephenson (born July 27, 1986) is a Canadian actor and was in the Arts York Drama program at Unionville High School. He is best known for his starring roles in Radio Free Roscoe as Robbie and in System Crash as James . He has also guest starred on Naturally, Sadie, Dark Oracle and in the TV film Cyber Seduction: His Secret Life. As of 2008 he has a recurring role in Degrassi: The Next Generation. He plays Griffin a HIV positive character who strug...