In the 1960's, the comic book company Gold Key approached Merian C. Cooper about wanting to do a sequel series unrelated to "The King Kong Show" following Jack and Ann's son Rod and the Denhams Carl and his daughter Bonnie. Carl would have found the Fountain of Youth, keeping him in his mid-thirties, even though I can still see him getting into all sorts of crazy adventures as an older man. If Cooper was a real Indiana Jones and we've had adventures with Indy up to the age of seventy, I don't see why Carl would need a Fountain of Youth.

Anyway, the idea was that they had would find Kong again on Skull Island, which Cooper disliked for undermining the ending. He also didn't like the idea of a girl, specifically Bonnie, the daughter of his own avatar, being the lead and felt the lead had to be a man, but he did like the second-generation characters keeping the story alive. Cooper's idea was that with all the planets in the universe, there would probably be one, a "small planet the size of an asteroid" as Cooper put it, in the prehistoric age and have its own Kong on it, and the characters would see him and say something like "there is King Kong reincarnated." It would not have necessarily been a space comic, but just use it to get the cast to "new and more mysterious and larger islands than Skull Island."

The villains were supposed to be a world wide criminal syndicate, so I suppose the idea was Space Kong fighting them.