The Adventures of Gamba (lost English dub pilot of anime series; early 1980s)
From The Lost Media Wiki
A screenshot from the show.
Status: Lost
In the early 1980s, TMS Entertainment (then known as Tokyo Movie Shiensha) made an English dub of the first episode of The Adventures of Gamba, but it failed to sell. It was last shown at the Cartoon/Fantasy Organization convention where it was also rejected due to not falling under their interests.
The only evidence of it's existence is from a comment on Cartoon Reserch's article on the anime by anime historian Fred Patten who apparently tried very hard to pitch the pilot.