I know that the IMDB Message Boards might not be a good source, but according to the first reply on this thread from a DB fan(https://web.archive.org/web/20170209213101/http://www.imdb.com/title/tt0214341/board/thread/246140344), I came across mentions of two mysterious English dubs of DBZ that have never been heard anywhere else: 1. An English dub of the anime by an unknown company (not Harmony Gold) (unknown year): The only things known about this dub is that it aired on TV at 2:00 AM (a bad timeslot, most likely in the USA) and only made it to episode 3 before being pulled off the air due to low viewership. 2. An English dub of DBZ that was released in France that ran for 100 episodes (most likely the first 100 episodes). The company was not mentioned, but it's most likely AB Groupe, the company that has done various European dubs of the DB franchise and distributed/helped out with the Westwood (DBZ)/Blue Water Studios (DB and DBGT) dubs of the franchise in the 2000's. I think the user heard about those two dubs from somewhere or has seen one of them (most likely the latter), but I didn't see any source to back this up. If you have any more info of those two mysterious English dubs of DBZ or remember seeing one of those dubs, you are welcome to reply. (BTW, he also mentioned the Speedy dub, but we already know that dub exists)