Christopher Heyerdahl is a Canadian actor who portrayed Alastair in Supernatural, the Wraith Todd and the Athosian Halling in Stargate Atlantis, Sam in Van Helsing, "Swede" in Hell on Wheels, Bigfoot and John Druitt in Sanctuary, and Marcus in The… Christopher Heyerdahl is a Canadian actor who portrayed Alastair in Supernatural, the Wraith Todd and the Athosian Halling in Stargate Atlantis, Sam in Van Helsing, "Swede" in Hell on Wheels, Bigfoot and John Druitt in Sanctuary, and Marcus in The Twilight Saga.
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