Tsuburaya had previously collaborated with Chaiyo on the production of two movies , `` The 6 Ultra Brothers vs. the Monster Army '' and `` Jumborg Ace & Giant '' -- the latter of which featured another Tsuburaya superhero , Jumborg Ace -- in 1974 .
Tsuburaya had previously worked together with Chaiyo on the production of two movies , `` The 6 Ultra Brothers vs. the Monster Army '' and `` Jumborg Ace & Giant '' -- the latter of which featured another Tsuburaya superhero , Jumborg Ace -- in 1974 .