[Bloody Sam Roberts]

Which repeating villain was played by a different actor each time

Hmmm. Good one. The only one that comes to mind who was played by different actors was Mr. Freeze. I know Otto Preminger was not the only one...though I don't recall the names of the other actors.

[william clark]

That’s the one, played by:

George Sanders
Otto Preminger
Eli Wallach