The Space Explorers is an EXTREMELY hard one to even locate any information about. So far, on the entire Internet I have located ONLY three websites. To help identify and refresh your memories, refer to these three websites.
www.cartoonresearch.com/faqx.html
www.thespaceexplorers.com/
www.astronautix.com/articles/theorers.htm
So who can add a fourth website??? The rarer it is the more I like it. It was copyrighted in 1957 and re-released (re-copyrighted) by Cartoon Classics Inc. in about 1978 (source: Audio Brandon Films 16mm catalog). How long do copyrights last on films anway?
ps: Not to be confused with the series known as "Voltron, Defender of the Universe."