Suspicious symptoms afflicting a group of children on the coast may be linked to the death of a local man.
| Name | Type | Role | |
|---|---|---|---|
| Dusty Hughes | Writer | ||
| Amymay Bowes | Guest Star | Nurse | |
| Tom Wu | Guest Star | Dr Yip | |
| Anton Lesser | Guest Star | Marcus Gwilym | |
| Sam Friend | Guest Star | Pat | |
| Philip Bird | Guest Star | DCI Jim Tennant | |
| Ian Peck | Guest Star | Daryl Butler | |
| Graham O'Mara | Guest Star | Man on Slab | |
| Peter Wight | Guest Star | Lucas Garner | |
| Alex Hughes | Guest Star | Teacher | |
| David Harewood | Guest Star | Angus Stuart | |
| Kate Fleetwood | Guest Star | Sienna Ricci | |
| Ozzie Yue | Guest Star | Micky Choo | |
| Rebecca Bridges | Guest Star | Lanny Forbes | |
| Natalie Press | Guest Star | Nicola Butler | |
| Emma Handy | Guest Star | DS Gwenda Newton | |
| Phyllis Logan | Guest Star | Helen Wharton | |
| Billy Hill | Guest Star | Paul Williams | |
| Patrick Lau | Director |