Barclay’s ordinary life becomes a world of terror when an ancient species rises from the sea. As UNIT fights for control, the summit on the Thames reveals terrifying secrets.
| Name | Type | Role | |
|---|---|---|---|
| Russell T. Davies | Writer | ||
| Delroy Brown | Guest Star | Jackson St Lewis | |
| Jennifer Jones | Guest Star | BBC Newsreader | |
| Leo Anthony | Guest Star | Roger Trevithick | |
| Rodo Gener | Guest Star | Agustin | |
| Edward Wu | Guest Star | Chinese Newsreader | |
| Gethin Alderman | Guest Star | Homo Aqua | |
| Henry Nott | Guest Star | Corporal Pip Morgan | |
| Lachele Carl | Guest Star | Trinity Wells | |
| Charles Sandford | Guest Star | Homo Aqua | |
| Waleed Hammad | Guest Star | Colonel Tariq Hashim | |
| Adrian Lukis | Guest Star | Sir Jonathan Hynes | |
| Fia Hadeed | Guest Star | Private Bushra Abdallah | |
| Dylan Holmes Williams | Director |