ling ▁leg ends . ▁ ▁Blue ▁Dem on ▁retired ▁from ▁the ▁ring ▁in ▁ 1 9 8 9 , ▁aged ▁ 6 7 , ▁at ▁the ▁Mon ter rey ▁Arena , ▁where ▁he ▁appeared ▁in ▁a ▁final ▁match , ▁team ing ▁up ▁with ▁his ▁adopt ive ▁son , ▁Blue ▁Dem on ▁Jr . ▁ ▁Act ing ▁career ▁ ▁Blue ▁Dem on ▁first ▁appeared ▁in ▁came os ▁in ▁a ▁couple ▁of ▁l uch ador ▁films ▁released ▁in ▁ 1 9 6 1 - 1 9 6 2 , ▁" The ▁Kill ers ▁of ▁L ucha ▁Lib re " ▁and ▁" F ury ▁in ▁the ▁Ring ", ▁in ▁which ▁he ▁was ▁one ▁of ▁several ▁wrest lers ▁more ▁or ▁less ▁in ▁the ▁background . ▁But ▁in ▁ 1 9 6 4 , ▁En rique ▁Ver g ara , ▁the ▁producer ▁of ▁the ▁then - success ful ▁Santo ▁mov ies , ▁decided ▁to ▁divers ify ▁by ▁allowing ▁the ▁ 4 2 - year - old ▁Blue ▁Dem on ▁to ▁star ▁in ▁a ▁series ▁of ▁l uch ador ▁films ▁of ▁his ▁own . ▁The ▁plots ▁of ▁the ▁Blue ▁Dem on ▁films ▁are ▁thought ▁to ▁be ▁extremely ▁similar ▁to ▁those ▁of ▁Santo ' s ▁films . ▁Santo ▁was ▁asking ▁for ▁a ▁sal ary ▁increase ▁at ▁the ▁time ▁and ▁Ver g ara ▁wanted ▁to ▁cultiv ate ▁a ▁second ▁movie ▁star . ▁ ▁From ▁ 1 9 6 4 ▁to ▁ 1 9 7 9 , ▁Blue ▁Dem on ▁star red ▁in ▁a ▁total ▁of ▁ 2 5 ▁action / hor