Christopher Heyerdahl (born September 18, 1963) 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.

[3] Heyerdahl is primarily known for his recurring role as the enigmatic "Swede" in AMC's Hell on Wheels.

[4][5] This post-American Civil War drama debuted as the second highest rated original series in AMC history.

In this film, he played a vampire, Marcus, who is part of a powerful Italian family called the Volturi.

He reprised that role in both parts of Breaking Dawn, the two-part adaptation of the fourth book in the Twilight Saga.