The TARDIS arrives on an extinct volcanic island. Before long, the travellers are captured and taken into the depths of the Earth, where they find a hidden civilisation — the lost city of Atlantis.
Unfortunately the movie Doctor Who: The Underwater Menace is not yet available on HBO Max.
| Directing | Julia Smith | Director |
| Writing | Geoffrey Orme | Writer |
| Production | Innes Lloyd | Producer |
| Writing | Gerry Davis | Script Editor |
| Sound | Dudley Simpson | Original Music Composer |
| Crew | Brian Hodgson | Special Sound Effects |
| Costume & Make-Up | Alexandra Tynan | Costume Design |
| Sound | Delia Derbyshire | Theme Song Performance |
