Nathaniel Stephenson (born July 27, 1986), credited as Nathan Stephenson, is a Canadian actor. He is best known for starring as Robbie "Question Mark" McGrath in the teen comedy-drama Radio Free Roscoe (2003–2005) and as James Alexander in the sketch comedy series System Crash (2001). He also had a recurring role as Griffin Pierce-Taylor, an HIV-positive university student, in Degrassi: The Next Generation (2007–2008).
Early life Stephenson was born in Toronto, Ontario. He began performing in community musical theatre as a child, including playing Judah in a production of Joseph and the Amazing Technicolor Dreamcoat. He attended Unionville High School in Markham, Ontario, where he was enrolled in the Arts York Drama program.
Career Stephenson made his television debut in 1999 on the YTV sketch comedy series System Crash, playing James Alexander, a member of the show's high school media club. He was 13 years old at the time.
In 2003, Stephenson was cast as Robbie "Question Mark" McGrath in Radio Free Roscoe, a Family Channel teen comedy-drama about four high school friends who operate an underground pirate radio station. The series also aired on The N in the United States. Stephenson appeared in all 52 episodes over four seasons. The series won the Gemini Award for Best Children's or Youth Fiction Program in 2005.
In 2007, Stephenson joined the cast of Degrassi: The Next Generation for its seventh season as Griffin Pierce-Taylor, an engineering student who is HIV-positive. The character, who was born with HIV due to his mother's drug use during pregnancy, enters a serodiscordant relationship with main character Paige Michalchuk; the storyline addressed themes of stigma and disclosure.
That same year, Stephenson appeared in the Disney Channel television film Twitches Too as Marcus WarBurton. His other credits include guest appearances on Naturally, Sadie, Dark Oracle, and The Dresden Files, as well as a supporting role as Gord in the 2010 Family Channel television film My Babysitter's a Vampire, which served as a pilot for the subsequent series.
Stephenson's later work consisted primarily of voice acting, including the role of Jasper in the animated series Pearlie (2009–2010). His final credited role was as Klaus in BeyWarriors: BeyRaiderz (2014).
Filmography Year Title Role Notes 2001 System Crash James Alexander Main role 2003–2005 Radio Free Roscoe Robbie "Question Mark" McGrath Main role; 52 episodes 2004 Childstar Chad Film 2005 Cyber Seduction: His Secret Life Guy in Locker Room TV film 2006 Heartstopper Walter Film Dark Oracle Emmett 9 episodes Naturally, Sadie Jamie 2 episodes 2007 Twitches Too Marcus WarBurton TV film The Dresden Files Dante Aureus Episode: "Walls" Degrassi: The Next Generation Griffin Pierce-Taylor 8 episodes 2008 Gotta Catch Santa Claus Errol / Gabriel (voices) TV film The Jon Dore Television Show Environmental Fundraiser Episode: "Jonathan-A-Thon" 2009 Pearlie Jasper (voice) 12 episodes Skyrunners Darryl Butler TV film 2010 My Babysitter's a Vampire Gord TV film Aaron Stone Connor Episode: "Pack-Man" 2011 Nikita Division Tech Episode: "Free" 2012 Warehouse 13 Grad Student #2 Episode: "The Evil Within" Alphas Bip Episode: "Alphaville" BeyWheelz Ken (voice) 2 episodes 2014 BeyWarriors: BeyRaiderz Klaus (voice) 2 episodes 2025 Hearts Around the Table: Shari's Second Act David TV movie
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