An earthquake stirs up yet another adventure for the Oz Kids. What begins as an innocent bus trip for Frank (the Wizard's son) turns into a wild underground ride for all the kids as they encounter dragonettes, merry-go-round mountains, an enormous teddy bear and more!
Unfortunately the movie Underground Adventure is not yet available on HBO Max.
| Directing | Stephen J. Anderson | Director |
| Directing | Bert Ring | Director |
| Writing | L. Frank Baum | Novel |
| Writing | Willard Carroll | Writer |
