I watched At The Earth's Core and Warlords of Atlantis recently and they didn't stand the test of time for me. I can't remember how impressed I was with these films at the time. The first Doug McClure film The Land That Time Forgot stood up better and I suspect Michael Moorcock's involvement in the screenplay probably helped. I do remember going to the cinema to see that one!
I also used to enjoy reading comics about this chap:
But more about him another time!