伝記: From Wikipedia, the free encyclopedia. Tahmoh Penikett (born May 20, 1975 in Whitehorse, Yukon, Canada) is a Canadian actor best known for his roles as Karl "Helo" Agathon on the Sci Fi Channel's television program Battlestar Galactica and as Paul Ballard in Joss Whedon's series Dollhouse on the Fox network.