Jessica Steen hasn't done much since this except bombs and low budget movies (Armaggedon, Judgement, Left Behind: World at War, etc).
Body builder Sven-Ole Thorsen (Hunt for Red October, The Running Man) of course is in this too. And the actor who played "the cigarrette smoking man" on the X-Files is in one episode.
Lord Dredd went on to play "George" on La Femme Nikita the tv show (which I really didn't watch, only caught bits of it, but I saw the movie, which of course was totally different).
IMDB.com lists a "Captain Power: the Beginning" (aka "Against the New Order") which I never saw. Apparently it's a feature length thing that's some episodes stiched together. I wonder if there's any way somebody can release that? A bootleg was also released by someone on VHS that I never saw (but saw advertised on ebay once) called "The Return of Captain Power" or something like that. Apparently it was some kind of fan edit to bring back Pilot.