Christopher Heyerdahl
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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
Heyerdahl at Comicon Stuttgart, Germany – Nov. 2024
Revisions (Stargate SG-1)
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"Revisions" is the 5th episode from the seventh season of the science fiction television series Stargate SG-1 and is the 137th episode overall. It was first broadcast on the Sci-Fi Channel on July 11,
The episode was written by Joseph Mallozzi (left) and Paul Mullie (right).
Christopher Heyerdahl makes his first appearance in the franchise