While this is fairly well-known among the Dragon Ball fanbase, here's a brief summary for the uninitiated.
Back in the 1980's, Harmony Gold was one of the bigger distributors of anime in the west, with one of their more notable projects being "Robotech", a combination of several other Japanese shows (including Macross), but that's a different story for another time.
In the late 80's, they acquired the rights to produce their own dub of Dragon Ball.
The dub changes the names of several characters, with one of the more infamous being Goku's being changed to…
Curiously enough, the dub had several fairly well-known voice actors attached to it, with Wendee Lee (who has over 200 voice acting credits) voicing Lena (Bulma), Cheryl Chase (Angelica from Rugrats) as Squeaker (Puar), and Barbara Gordon (Rita Repulsa from Power Rangers) voicing Zero (Goku).
Supposedly, only five episodes of the dub were ever produced (the first and third movie were also dubbed and edited together as a special, which is the most available form of any part of this dub), and the series only ever aired on independent stations in the U.S. at a very early time in the morning, so it never caught on and was quietly cancelled. Because it was never released on VHS or any other home video format, it has become quite rare, and very little footage of it exists online.
But still, this is a very interesting period in Dragon Ball's history. If it caught on, it's entirely possible that Dragon Ball would be much different in the west than it is today.