- 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 (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: The Undiscovered Country (1991), Dr. Ira Graves in the Star Trek: The Next Generation (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).
- Was awarded the 1995 Drama-Logue Award for "The Homecoming" at the Matrix Theatre.
- 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).
- Graduated from Royal Academy of Dramatic Art (RADA) in London, England.
- Is among 26 actors that have appeared in both the Doctor Who and Star Trek franchises.
- Was the runner-up for the role of Ambassador G'Kar on Babylon 5 (1993).
- He used to correspond with fans on the IMDb Message Boards (back when they existed); his screen-name was wmorgs.
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