There was a 60's movie in the works. It would have starred... CHUCK CONNERS as Doc Savage, and it would have been made by the same team that worked on Branded. It was never made because they got the movie rights from Conde Nast, but the movie rights were actually still retained by Lester Dent's widow, which scuttled the deal. The only thing that came about because of this deal was the Dell comic book adaption of the Thosand Headed Man.

I've also heard that a cartoon that was going to be done by Hannah-Barbera. They ultimately dropped the "Doc Savage" angle, and instead adapted it into their original show Johnny Quest...