O Planeta Secreto
| Book | First Lensman |
| Format | Paperback |
| Language | Portuguese |
| This Edition Published | 1979 |
| Author | E. E. 'Doc' Smith |
| Translated by | Eurico da Fonseca |
| Cover Art by | António Pedro |
| Publisher | Livros Do Brasil |
| Publisher Series | Colecção Argonauta |
| Series | Lensman |
| Format | Paperback |
| Language | Portuguese |
| Location | Portugal |
| This Edition Published | 1979 |
| Series Number | 265 |