Tahmoh Penikett ([ˈtaʔmo]; ; born May 20, 1975) is a Canadian actor. He is known for playing Karl "Helo" Agathon on SyFy's 2004 television series Battlestar Galactica. He has appeared in TV series Supernatural, Dollhouse, the Showcase time travel show Continuum, and as the antagonist Darius in the 2006 racing video game Need for Speed: Carbon.