The Land That Time Forgot is a classic B movie , and McClure is a classic B movie actor. I think there was a remake on the Sci Fi Channel, but I didn't bother watching it, so I've no idea just had bad it is. It also appears as one of the movies in Mystery Theatre 3000 which is worth a watch. It's a shame that he sequel 'The People That Time Forgot' wasn't up to much , but the original still stands up fairly well.
Ive seen the People that Time Forgot , godawful film
I loved At The Earths Core with McClure and Peter Cushing . Cheesy but fun to watch .You can see that both actors had a lot a fun doing this film.