Christopher Heyerdahl
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Christopher Heyerdahl is a Canadian actor who portrayed Alastair in Supernatural, the Wraith Todd in Stargate Atlantis, Sam in Van Helsing, "Swede" in Hell on Wheels, and Marcus in The Twilight Saga.
Heyerdahl at The Sanctuary Experience Convention in Vancouver in 2010
Stargate Atlantis
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Stargate Atlantis is an adventure and military science fiction television series and part of MGM's Stargate franchise. The show was created by Brad Wright and Robert C. Cooper as a spin-off series of Stargate SG-1, which was created by Wright and Jonathan Glassner and was itself based on the feature film Stargate (1994). All five seasons of Stargate Atlantis were broadcast by the Sci-Fi Channel in the United States and The Movie Network in Canada. The show premiered on July 16, 2004; its final episode aired on January 9, 2009. The series was filmed in and around Vancouver, British Columbia, Canada.
Season 4 cast from left to right: Dr. Rodney McKay, Col. Samantha Carter, Lt. Col. John Sheppard, Teyla Emmagan, and Ronon Dex.
Cooper, writer and executive producer for the show with Wright
Joe Flanigan, one of many main characters, at Comic Con 2007
Atlantis was filmed at The Bridge Studios in Vancouver, British Columbia, Canada.