"The Tales Under the Mountain" is inspired by the TV series "The Third Eye" which aired in the United States from 1981 to 1982. The story tells about a pair of twins who discovered that there was a strange power hidden under an extinct volcano in Oakland. It turns out that under the crater lived alien monsters who had fought a fierce battle with humans. Now they have been awakened from their slumber and are ready to destroy humans. The brother and sister bravely stand up to fight the alien monster together with the mysterious Mr. Jones!