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. Heyerdahl was born in British Columbia, and is of Norwegian and Scottish descent. His father emigrated from Norway to Canada in the 1950s. Thor Heyerdahl was his father's cousin. Heyerdahl also speaks Norwegian and studied at the University of Oslo. Heyerdahl is primarily known for his recurring role as the enigmatic and sinister "Swede" in AMC's Hell on Wheels. This post-American Civil War drama debuted as the second highest rated original series in AMC history. He is also known for his role as Leonid in the Are You Afraid of the Dark? episode "The Thirteenth Floor" and as Nosferatu in the episode "Midnight Madness". He played the characters Halling and Wraith commander Todd in Stargate Atlantis, and Pallan in the Stargate SG-1 episode "Revisions".He played H. P. Lovecraft in the film Out of Mind: The Stories of H. P. Lovecraft (1998) and a punk, new at drug dealing, in Cadavres (2009). He played the part of the demon Alastair in three episodes of Supernatural. He also played the part of Zor-El in the television series Smallville, as well as playing John Druitt and Bigfoot in the series Sanctuary. He played the part of Dieter Braun on True Blood during the show's 5th season. His most notable film role was in the feature film New Moon, an adaptation of Stephenie Meyer's second book in her Twilight Saga. 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. He has also performed on stage and was a member of the Young Company at the Stratford Festival in 1989 and 1990. Christopher Heyerdahl(1963년생, British Columbia, Canada) 는 배우로, 대표작으로 토고, 스톡홀름, 코너 오피스가 있으며, 그 외에도 수퍼내추럴, CSI: 라스베가스, 스몰빌, 애로우, 캐슬, 스타게이트 SG-1, 싸이크, 스콜피온, 머독 미스터리, 스타게이트 아틀란티스, 고담, 더 라스트 오브 어스 등 다양한 작품에 출연했다. 특히 2026년에는 The Vampire Lestat에도 참여해서 활동중이다. (오뜨랑에서 실시간으로 번역된 한글 프로필도 확인할 수 있어요) 2026년 The Vampire Lestat에서 Marius de Romanus 역을 맡았다. 2026년 The Borderline에서 Charlie 역을 맡았다. 2025년 Le train에서 Jack 역을 맡았다.