As per the terms of the agreement, "Marine Boy" was first run as a syndicated program throughout the U.S. and in international markets from late 1967 onwards. The Japanese version of the series was eventually sold to Fuji TV and aired on Mondays at 6 pm between 31 January 1969 and 22 September 1969, with only the first 36 episodes broadcast. It was later bought by Nippon TV, all 78 episodes airing Monday to Friday at 5:00 pm between 11 May to 2 September 1971.