Well, I don't know about movies, but I would certainly have liked to see him in the starring role in the tv series SPACE:1999. It's long been mentioned that he was at least interviewed by Gerry and Sylvia Anderson for the role, and Sylvia Anderson has long said that she would have loved him in the role as Commander Koenig.
That's not to say that Martin Landau didn't do a great job because he clearly did. But I can't help wondering what Robert Culp would have brought to the role. And it would have been great to see him writing scripts for the series too.
Plus, I guess it would have been cool having Mr Culp filming here in England for a few years...
