Kagaku ninja tai Gatchaman

Tojo island, in the country Rizoto, sinks into the sea because of mysterious movements in the Earth's crust. Jun has gone to investigate the small islands in the vicinity and goes into a cave on one island. There she falls into a trap of a Galactor spy disguised as a survivor. The spy then disguises herself as Jun and penetrates G-Town. In the engineering room she installs a cloaking device. G-Town is being led towards a Galactor trap on the bottom of the sea. In reality, the spy is Eva, the daughter of Bill Douglas, who has developed the machinery of G-Town. She is being used by Galactor who told her the lie that her father was killed by the Science Ninja Team. Elsewhere, Jun has escaped from the enemy's prison. She attended the death of Bill Douglas there who was severely tortured. Jun goes back to G-Town and tells Eva what actually happened. Jun gives her a keepsake from her father.