The Secret of Mastodon Valley
- Episode aired Sep 11, 1986
- TV-Y7
- 25m
After defeating Apparitia and Airhead the Ghostbusters head back to prehistoric times, looking for another piece of the stone.After defeating Apparitia and Airhead the Ghostbusters head back to prehistoric times, looking for another piece of the stone.After defeating Apparitia and Airhead the Ghostbusters head back to prehistoric times, looking for another piece of the stone.