Among many other things, “Babylon 5” is show creator J. Michael Straczynski’s commentary on E.E. “Doc” Smith’s Lensmen Saga and its two overarching alien rivals — the good-guy Arisians and the bad-guy Eddorians. In B5 these become the Vorlons and Shadows, respectively — not so much good and evil as order and chaos, with the Vorlons preferable of the two but still problematic, and both seeing younger races — such as humanity — as children who need a firm hand… and who need to show which parent they love more. The Vorlons are eventually shown to center on the question “Who are you?” but the Shadows’ question, “What do you…