I just read that Keye Luke did the original voice of Space Ghost cartoon villain “Brak” on the Hanna Barbara series in the late 60s. Brak/Keye appeared with his brother Sisto as space pirates. The two were cat-like aliens planning to take over the galaxy. Brak and Sisto were the main villains in the episodes "The Lure" and "The Looters" as well being featured in a multi-part "Council of Doom" storyline. Keye Luke did the voice for all of Brak's original "Space Ghost" appearances. (Someone else did it for the revival and satire years later)
Thank you for this information! It doen't surprise me though, as the multi-talented Keye Luke was very active in so many ways from stage, to movies, to television, to cartoons. I have to add that another Number One Son (from the 1957-58 Chan TV series), James Hong, is very similar in this regard.