▁a ▁month ▁before ▁its ▁transmission ▁date , ▁meaning ▁that ▁composer ▁Mal col m ▁Clar ke ▁only ▁received ▁the ▁first ▁episode ▁for ▁scoring ▁a ▁week ▁before ▁broadcast , ▁having ▁to ▁rely ▁on ▁musical ▁c ues ▁he ▁had ▁recorded ▁weeks ▁earlier ▁without ▁having ▁seen ▁any ▁foot age . ▁ ▁Th emes ▁and ▁interpretation ▁W riter ▁Barbara ▁C leg g ▁based ▁the ▁E tern als ▁on ▁a ▁wealth y ▁group ▁of ▁her ▁relatives , ▁who ▁upon ▁visit ing ▁her ▁had ▁demanded ▁constant ▁entertain ment , ▁tre ating ▁other ▁family ▁members ▁almost ▁as ▁" less er ▁be ings ". ▁C leg g ▁also ▁drew ▁insp iration ▁from ▁the ▁Bible ' s ▁Book ▁of ▁Gen esis , ▁der iving ▁the ▁prize ▁of ▁en light en ment ▁from ▁The ▁Tree ▁of ▁Know ledge ▁within ▁it , ▁while ▁having ▁read ▁about ▁Sol ar ▁wind s ▁she ▁decided ▁to ▁use ▁them ▁as ▁the ▁basis ▁of ▁prop ulsion ▁for ▁space ▁vessels . ▁C leg g ▁highlight ed ▁the ▁nature ▁of ▁en light en ment , ▁showing ▁it ▁not ▁to ▁be ▁knowledge , ▁as ▁the ▁E tern als ▁believe , ▁but ▁wisdom , ▁as ▁demonstrated ▁by ▁T url ough ' s ▁re jection ▁of ▁the ▁Black ▁Guardian . ▁ ▁The ▁episode ▁makes ▁use ▁of ▁a ▁regular ▁tro pe ▁from ▁science - f iction : ▁b ored , ▁god - like ▁be ings ▁playing ▁with ▁the ▁lives ▁of ▁mort als ▁for ▁the ▁purpose ▁of ▁am usement . ▁ ▁In ▁their ▁book ▁About ▁Time , ▁Lawrence ▁Mil es ▁and ▁Tat ▁Wood ▁li ken ▁this ▁to