Original: 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.
Simplified: 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.