Knudsen was born on March 25, 1988, in
Toronto,
Ontario. His first film debut was in the 2000 film
Tribulation. In 2001, Knudsen guest starred on
The Guardian and appeared in three other episodes. He was nominated for a Young Artist Award for his performance. In 2003, Knudsen starred in the TV series
Mental Block. He co-starred as Leroy "Lefty" in the
film adaptation of
Youth in Revolt, and in
Scott Pilgrim vs. the World as Lucas "Crash" Wilson, who was the lead singer of fictional band Crash and the Boys. In 2005, he co-starred in the horror film
Saw II. From 2006 to 2008, he played the series regular role,
Dale Turner in the
CBS series
Jericho. Knudsen played Ryan in
The Barrens, co-starring
True Bloods
Stephen Moyer, which was released in late 2012. He portrayed teen tech genius Alec Sadler in the Canadian science fiction series
Continuum, starring alongside
Rachel Nichols and
Victor Webster, and was nominated for Best Supporting Actor for the role for two consecutive years at the
Saturn Awards. He appears in
Bon Cop, Bad Cop 2, the horror feature
Darker Than Night, as well as Stephen King-based sci-fi TV series
The Mist and space adventure drama series
Killjoys. ==Filmography==