Astro and Uran visit Bee Island, a breeding ground for bees, on an island-hopping cruise. They meet Christopher, who is looking for his father Prof. McGowan who has disappeared on the island. They go to an underground city on the island, searching for the missing Prof. McGowan. Astro finds him, who is the victim of mind control following the hypnotic sting of a robot bee, and demesmerizes him.