- As of December 2004, he has appeared on Star Trek 27 times, as 11 different characters of 8 different races (two Cardassians (Gul Danar, Seskal), a Vidiian, a Hirogen, a Romulan (Telek R'Mor), three Klingons (Korris, Korath), a former Borg drone (Two of Nine/Lansor), a Kreetassan, and a Human (Admiral Forrest)).
- Recently formed a blues band with Star Trek co-stars Richard Herd (Admiral Paris from Star Trek: Voyager (1995)), Casey Biggs (Damar from Star Trek: Deep Space Nine (1993)) and Steve Rankin (multiple roles).
- Is the only actor to play five different characters on a single Star Trek series (Star Trek: Voyager (1995)).
- Along with Jeffrey Combs, he is one of only two actors to played three characters in a single Star Trek season (Star Trek: Enterprise (2001) Season One).
- Auditioned for the role of Commander William T. Riker on Star Trek: The Next Generation (1987), which went to Jonathan Frakes.
- His late father was a huge fan of Star Trek (1966).
- His Star Trek: Enterprise (2001) character, Admiral Maxwell Forrest, was named after the late DeForest Kelley who played Dr. Leonard "Bones" McCoy on Star Trek (1966). Kelley died on June 11, 1999.
- Reprised his role as the Klingon 'Korath' (from the 'Star Trek: The Experience' exhibit) on the series finale of Star Trek: Voyager (1995). (June 2001)
- One of four actors to appear in all four live-action Star Trek spin-off series -- the others are Randy Oglesby, Thomas Kopache and Jonathan Frakes. Armstrong is the only one of the four to appear in multiple episodes of each series.
- Appeared in both the second ('Past Prologue') and second last ('Dogs of War') episodes of Star Trek: Deep Space Nine (1993). He played Gul Danar and Seskal respectively, both of whom were Cardassians.
- Has accepted to be the godfather of the Belgian Star Trek fan club BVC.
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