The tape was dark because it was made from dailies, which haven't been
color corrected, and because the setup lent more darkness to them; by the time
anyone figured how to lighten the picture, it was half done.
As Harlan commented...yes, there may be a sequel to "Demon With a Glass
Hand," in which that character, played by Culp, would come to B5, still living
out the centuries as programmed. We'll see....