Continuation: King Kong vs. Godzilla

Continuation: King Kong vs. Godzilla is an unmade Showa film written by Shinichi Sekizawa and produced by Toho, intended to be released in 1963. It was replaced by Mothra vs. Godzilla.

Plot
A Japanese plane crashes in Africa resulting in a search party lead by a man named Nomura. He discovers a single child survived the crash and is being cared for by Kong in the ruins of an ancient city. When a giant scorpion arrives and battles Kong Nomura rescues the child and they flee to Japan with Kong hot on their trail. At the same time Godzilla's body is found and transported to a theme park on an island in the Seto inland sea. When Kong arrives at the theme park Godzilla is awoken by electricity and the two battle again. It ends in a draw with each kaiju going their own ways but Kong goes straight to Japan looking for the child. Eventually Kong and Godzilla have a finally battle at Mt. Aso which erupts with both the kaiju being swallowed up by the Volcano.

Production
Following the immense success of King Kong vs. Godzilla (1962), which when adjusted for inflation would be the highest grossing Godzilla film of all time, it's not surprising that the first concept considered for the next Godzilla movie was one that pitted the two monsters against each other again. Literally titled Continuation: King Kong vs. Godzilla, the proposal for this project was written by Shinichi Sekizawa, who also worked on the previous film, and the draft was submitted in 1963. Unfortunately, the concept never got past the proposal stage, and a more fleshed out script was never commissioned while Sekizawa's ideas for the sequel remain mostly unknown. Consequently, Godzilla would end up taking a break that year, although the character would return with two feature films in 1964 and was also considered for a third: Frankenstein vs. Godzilla.