The Final GGG OVA series was broadcast on TV as a series a year or so after it finished its OVA run. In this run scenes related to Betterman were inserted to tie the two together. Later, there was a manga that took place ~10 after the conclusion of Final GGG where a new GGG manages to rescue the original GGG and fight with and against different cast members of Betterman. The Akamatsu Industries of Betterman is the same organization in GGG. Like all GGG related content none of this exists officially in English in its original form. The only way the non-Japanese market has access to officially localized GGG content is from Super Robot Wars. SRW30 uses the plot of the manga for the GGG characters and assumes knowledge of both GGG, Final GGG, and Betterman.
@@thorscape3879 The original plan was to create a successor series to GaoGaiGar that would further connect it to Betterman. Incidentally this would have made Final GGG the canonical version of Final.
