- He was praised by his former Supernatural (2005) co-star, Jensen Ackles, at the LA Supernatural Convention in 2011. Ackles says that during the torture scene of Christopher's character "Alastair", Ackles was thinking "Wow, I'm totally being out-acted here", after that Ackles turns to the audience and asks them "I mean, wasn't he good?" The audience replies with massive applause.
- He is half Norwegian and half Scottish.
- Thor Heyerdahl is a cousin of his father.
- Has played a vampire leader on Van Helsing (2016), True Blood (2008) and The Twilight Saga: New Moon (2009). Has also played a demon on Supernatural (2005).
- Has appeared with Michael Shanks and Amanda Tapping on three different series: Stargate SG-1 (1997), Stargate: Atlantis (2004) and Sanctuary (2008).
- Such a big fan of KISS (Ace Frehley in particular), Heyerdahl incorporated Frehley's Starman makeup as a tattoo of his character "Todd" in Stargate Atlantis.
- Appeared as villains on both Smallville (2001) and Gotham (2014). Both series are based on the early years of iconic DC superheroes (Superman and Batman).
- Has appeared with Ryan Robbins on four different series: Stargate: Atlantis (2004), Sanctuary (2008), Caprica (2009) and Hell on Wheels (2011).
- Tortures one of the main characters in both True Blood (2008) (portraying vampire Dieter) and in Supernatural (2005) (portraying demon Alastair).
- Performed at Canada's Stratford Festival in 1989 and 1990.
- Nephew-in-law of Jacqueline Beer.
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