8 , ▁ 1 9 5 5 ▁and ▁ending ▁its ▁run ▁of ▁original ▁episodes ▁on ▁June ▁ 1 0 , ▁ 1 9 5 6 . ▁It ▁remained ▁in ▁synd ic ation ▁until ▁ 1 9 6 0 . ▁Mode led ▁on ▁the ▁science ▁fiction ▁space ▁oper as ▁popular ▁at ▁the ▁time ▁( cf . ▁Captain ▁Video ▁and ▁Space ▁Pat rol ), ▁it ▁featured ▁sets ▁and ▁cost umes ▁em ulating ▁the ▁fut ur istic ▁designs ▁of ▁Buck ▁Rog ers ▁and ▁Flash ▁Gordon . ▁ ▁Prem ise ▁Scient ist ▁Captain ▁Z - Ro , ▁working ▁in ▁his ▁remote ▁labor atory , ▁saf egu arded ▁man kind ▁and ▁history ▁from ▁imp ending ▁harm . ▁He ▁had ▁a ▁time ▁machine , ▁the ▁Z X - 9 9 , ▁both ▁to ▁view ▁history ▁and ▁to ▁send ▁someone ▁back ▁in ▁time . ▁Each ▁week , ▁he ▁and ▁his ▁te en age ▁assistant ▁Jet ▁would ▁view ▁an ▁episode ▁in ▁time ▁and ▁in ev it ably ▁see ▁that ▁some ▁event ▁was ▁unfold ing ▁contrary ▁to ▁history ▁( e . g ., ▁King ▁John ▁not ▁signing ▁the ▁Mag na ▁Cart a ). ▁Captain ▁Z - Ro ▁would ▁then ▁send ▁Jet ▁back ▁in ▁time ▁to ▁interven e ▁and ▁ensure ▁that ▁history ▁played ▁out ▁as ▁originally ▁recorded . ▁Over ▁the ▁years , ▁plots ▁involved ▁Z - Ro ▁and ▁Jet ▁res cu ing ▁a ▁wide ▁range ▁of ▁historical ▁figures , ▁including ▁G eng his ▁Khan , ▁Marco ▁Pol o , ▁Mag ellan , ▁William ▁the ▁Con quer or , ▁Bened ict ▁Arnold , ▁William