Pernell Roberts was Adam Cartwright.

My vote for B-movie actor would be Doug McClure. There's a kind of handsomeness that some guys have that makes their facial features so perfect that none of them stand out, and you can't remember what the guy looks like two seconds after you look away. D.McC is one of them. And he couldn't act. Troy Donohue comes to mind, too.

I disagree with the choice of Boris Karloff. He at least had some character. ANd his movies were usually entertaining.

We need women here too. Sandra Dee, Annette Funicello, Ann-Margaret before she took acting lessons.