- Has played the same character, at an older age, as his son Mark Sheppard in an episode of Doctor Who (2005), in an episode of NCIS : Enquêtes spéciales (2003), and in the movie Mysterious Island (2010).
- Father of Mark Sheppard.
- Like his son Mark Sheppard, he has made guest appearances on Star Trek: Voyager (1995), Charmed (1998) and Doctor Who (2005).
- A failed surgery at a young age resulted in his losing one of his eyes.
- Has appeared as different characters in four Star Trek productions. He was the Klingon prison warden in Star Trek VI : Terre inconnue (1991), Dr. Ira Graves in the Star Trek: La nouvelle génération (1987) episode, The Schizoid Man (1989), Qatai in the Star Trek: Voyager (1995) episode, Bliss (1999), and as the Vulcan Science Minister in Star Trek (2009).
- Along with Matt Frewer and Amanda Pays, he is one of only three actors to appear in both Max Headroom (1985) and Max Headroom (1987).
- Was awarded the 1995 Drama-Logue Award for "The Homecoming" at the Matrix Theatre.
- Is among 26 actors that have appeared in both the Doctor Who and Star Trek franchises.
- He used to correspond with fans on the IMDb Message Boards (back when they existed); his screen-name was wmorgs.
- Graduated from Royal Academy of Dramatic Art (RADA) in London, England.
- Was the runner-up for the role of Ambassador G'Kar on Babylon 5 (1993).
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