With Zaroff's plan nearing completion, the Doctor and Ben realise the only way to save the world is to destroy Atlantis.
| Title | The Underwater Menace (4) |
|---|---|
| Genres | Drama Action & Adventure Sci-Fi & Fantasy |
| Release Date | 1967-02-04 |
| Episode Runtime | 00 Hours 25 Minutes |
| Season Number | 4 |
| Episode Number | 22 |
| Production Companies | BBC |
