| # | Book Title | Author | |
|---|---|---|---|
| 1 | Return to the Cave of Time | Packard, Edward | |
| 2 | Through the Black Hole | Packard, Edward | |
| 3 | Forbidden Castle, The | Packard, Edward |
Juvenile Series and Sequels
| # | Book Title | Author | |
|---|---|---|---|
| 1 | Return to the Cave of Time | Packard, Edward | |
| 2 | Through the Black Hole | Packard, Edward | |
| 3 | Forbidden Castle, The | Packard, Edward |