Having a copy of "Kong Unmade: The Lost Films of Skull Island" by John LeMay, I was naturally introduced to "Space Kong." Now what is "Space Kong"? I will tell you as I best understand it even when reading from the book and I will go on record I am skimming over a few things.
Now, the idea stretches back to when it was unclear who actually owned Kong. The comic book company Gold Key had come to Cooper on the subject of a Kong comic book series. They wanted to adapt the novelization as the starting point, but wanted to carry on into sequel territory. Cooper had passed on sequel comics in 1954, but now, according to the book, it was the 1960's, the exchange beginning in 1966, the time of Batmania and very likely other things. The idea was to do a separate sequel series unconnected from Rankin-Bass' "The King Kong Show", following Carl Denham himself, his daughter Bonnie and Jack and Ann's son Rod, who would no doubt become romantically involved with Bonnie. Carl would have still been thirty-five (his age as stated in the novelization) because he found the fountain of youth and Kong would have been found alive again of Skull Mountain Island (going with the name given in the novelization rather than the more common shortened version, which is used in the book).
Now, Cooper disliked the idea of finding Kong alive again on Skull Mountain Island, feeling it undermined the ending of the film. I dislike it as well. If the islanders were terrorized by Kong to the point they had to build a wall and resort to human sacrifice just so he would leave them alone, then this was just an awful decision. How would he even still be alive? Were we supposed to believe he survived the airplanes and the fall from the Empire State Building and Carl was just like "I must return him to Skull Mountain Island!" Was it supposed to be a surprise to Carl too? What was the thought process here? My reaction would be less "Kong's alive!" and more "What the hell?"
Cooper also didn't like the idea of the lead being a girl, even if she was the daughter of his avatar Carl, though he did like the idea of a second generation of characters. He also liked the Fountain of Youth and I can understand why. With Carl being his avatar, Cooper wanted to continue his crazy adventures in some way and Carl continuing to have crazy adventures is a great idea. Cooper was a real life Indiana Jones and Carl was thus a predecessor of Indy, one of many, but I wouldn't ever want to see Carl live longer than his creator, the man he was avatar to. For me, Carl has to live to see 79. To kill him off in the 1930's would be disgraceful and to have him going on living indefinitely, living to be well older than Cooper feels weird.
Cooper came up with the idea of there being a planet in the "dynosaur age", as he put it (What the hell is that spelling?) with a creature who would be an exact duplicate of Kong in appearance, with the main characters saying something to the effect of "There is King Kong reincarnated." Cooper specified that it would not necessarily be space comic, but use space to get the cast to "new and more mysterious and larger islands than Skull Island", with this Skull Mountain Island in Space being a small planet the size of a large asteroid, where naturally, the Fountain of Youth would be found. The exact year given in the book is 1969, so going by Carl's age stated in the novelization, that would mean we'd have a seventy-two year old man doing space exploration. Carl doesn't even seem to need the Fountain of Youth if the idea was he was going on crazy adventures before he found it, but I suppose him being brought back to the physical age of thirty-five makes some points of adventuring easier. At some points, Carl is specifically stated to be living in the country of the fountain of youth.
But what exactly did Cooper say on the subject of Bonnie? That the dynamic character should be a man, as dynamic as Carl or Jack, that the dynamic character as always been a man, using examples like James Bond, Sherlock Holmes, Superman, etc. "Beauty should be the passive role not the active driving force." I get the feeling he wanted his avatar of Carl to continue to be the protagonist just as he had been in the original duology. He also thought that a reversal of the formula would result in failure.
Gold Key responded that the Fountain of Youth and Carl would be "at the end of the rainbow", elements that Rod, Bonnie and a friend of Rod's would be seeking, always on the verge of finding, but never do, which is disappointing. If their idea was for Bonnie to be looking for her father Carl who got lost on an exploration, you'd want her to find him. That would be the plot of the series, with no actual ending in sight. They would also be careful that the new Kong not be confused with the one who died in New York, so I presume a slightly different design was in consideration. The villains were meant to be a world-wide crime syndicate using then up-to-date business procedures. The men would be the heroic characters, but the search for Carl would begin with the one closest to him: his daughter Bonnie. Rather than an asteroid, the new Kong would just be found on a different island and it was suggested that the asteroid be saved for a remake.
So, sadly Space Kong was suggested and shot down just so a new Kong would be found elsewhere on earth. I presume with either version, the new Kong would have not been the brutal monster the original Kong was, as envisioned by Cooper, resulting in him leaving his island being different.
It might just have been me misunderstanding, but I think Carl joining his daughter and her friends on their adventures would have been better. Get Jack and Ann in there too, include a member of the Englehorn family, maybe Rod's friend was even meant to be Englehorn's grandson. Imagine Ann comparing the new Kong to the original, even bringing up the line from the original film where she said "I don't like to look at him, Jack. He just reminds me of that terrible day on the island (or my approximation of remembering that line) and outright saying she prefers this new Kong. If there is a second generation descended from the previous generation, then we want the previous generation involved to some extent. Be it a Kong from space or another island, we don't want the ending of the original undermined.
There are goods ideas, there are bad ideas, but ultimately the comic was never made, a Space Kong film was never made. Too bad, because the son of Jack and Ann and Carl's daughter going on adventures would be amazing.