Jerry reversed the usual formula of the superhero who goes to another planet. He put the superhero in ordinary, familiar surroundings, instead of the other way around, as was done in most science fiction. That was the first time I can recall that it had ever been done.
In the beginning, we had a great deal of freedom, and Jerry wrote completely out of his imagination - very, very freely. We even had no editorial supervision to speak of, because they were in such a rush to get the thing in before deadline. But later on we were restricted.
Not only that, but when I first met Joe, to my intense delight, he showed me that he was a collector. He was collecting some of the early Tarzan pages by Hal Foster, and, later, early Flash Gordons; and I found that we were both absolutely interested in the same type of thing.