Barclay becomes humanity’s ambassador when the mysterious Salt emerges from the Tank. But his family’s life is torn apart when Salt wreaks revenge upon all mankind.
| Name | Type | Role | |
|---|---|---|---|
| Pete McTighe | Writer | ||
| Benito Curteanu | Guest Star | Marko Novak | |
| Adrian Lukis | Guest Star | Sir Jonathan Hynes | |
| Edward Wu | Guest Star | Chinese Newsreader | |
| Alys Metcalf | Guest Star | UK Reporter | |
| William Gaminara | Guest Star | Ted Campbell | |
| Patrick Baladi | Guest Star | Sir Keith Spears | |
| Waleed Hammad | Guest Star | Colonel Tariq Hashim | |
| Zina Esepciuc | Guest Star | Russian Newsreader | |
| Lachele Carl | Guest Star | Trinity Wells | |
| Ray Sesay | Guest Star | Sierra Leone Delegate | |
| Cordelia Bugeja | Guest Star | Esther Spears | |
| Gethin Alderman | Guest Star | Homo Aqua | |
| Waseem Mirza | Guest Star | UK Newsreader | |
| Tim Wallers | Guest Star | Felix Gladstock | |
| Joshua Sinclair-Evans | Guest Star | Salt (Male) | |
| Antonia Bernath | Guest Star | Rose-Marie Hunt | |
| Charles Sandford | Guest Star | Homo Aqua | |
| Shanice Archer | Guest Star | USA Reporter | |
| Lucy Vandi | Guest Star | Dr Kadie Bangura | |
| Iestyn Arwel | Guest Star | Platoon Leader | |
| Jennifer Jones | Guest Star | BBC Newsreader | |
| Douglas Hansell | Guest Star | Australian Diplomat | |
| Dylan Holmes Williams | Director |