Ep. 9: Approaching the Mystery of the Big Cave.
Ipinalabas noong Hunyo 25, 1981
9
Mga Episode
- Ep. 5 · The Underground Boat Is...
- Ep. 6 · The Underground City
- Ep. 7 · Invitation to the Secret Base.
- Ep. 8 · Crisis of the Underground Explosion
- Ep. 9 · Approaching the Mystery of the Big Cave.
- Ep. 10 · Fight at the Holy Cave.
- Ep. 11 · Are the Millennium Thieves...Friend or Foe!?
- Ep. 12 · The Secret of the Telescope
- Ep. 13 · Escape in the Morning Mist