Trivia

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 Viaje a las estrellas: 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 (Viaje a las estrellas: Voyager (1995)).

Along with Jeffrey Combs, he is one of only two actors to played three characters in a single Star Trek season (Enterprise (2001) Season One).

Auditioned for the role of Commander William T. Riker on Viaje a las estrellas: La nueva generación (1987), which went to Jonathan Frakes.

His late father was a huge fan of Viaje a las estrellas (1966).

Reprised his role as the Klingon 'Korath' (from the 'Star Trek: The Experience' exhibit) on the series finale of Viaje a las estrellas: Voyager (1995). (junio de 2001)

His Enterprise (2001) character, Admiral Maxwell Forrest, was named after the late DeForest Kelley who played Dr. Leonard "Bones" McCoy on Viaje a las estrellas (1966). Kelley died on June 11, 1999.

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.