Beginning in 2000, Douglas landed guest spots on TV series such as "Cold Squad," "Dark Angel" "Stargate SG-1" and "The Outer Limits." He was soon splitting his time between television and feature films, with small supporting roles in Final Destination 2 and X2: X-Men United (both 2003). But his career shifted into high gear in 2004 when he was cast in the part of Galen Tyrol, the steadfast chief petty officer on "Battlestar Galactica" (which enjoyed a four-year run).
Douglas later joined the cast of the Netflix original series "Hemlock Grove" (2013), playing a lawman who probes a girl's grisly murder in a Pennsylvania steel town.
Deep in the universe, cybernetic Cylons have all but wiped out the human race, laying waste to the Twelve Colonies of Man. Cast out, the few survivors aboard the Battlestar Galactica search for a so-called 13th colony: the mythical planet Earth.