Goro is being bombarded by a strange star saucer manipulated by a young girl with a crystal ball. Yuko's little brother Taro has been taken hostage by the Neo-Humans. Goro goes to save her brother and he comes face-to-face with Star Bambara. Taro is reunited with his sister, but Goro discovers that the boy has been rigged with a bomb…

Geisel's Great Fort is the sixth episode of the Inazuman Flash tokusatsu series.