Kirstie Collins, who is helping Muriel McKendrick with the trial of a new drug, finds a severe adverse reaction from a patient, and wants to alert the drugs company, but McKendrick warns her against doing so. The staff of Darwin Ward, the cardiology ward, struggle to stop the spread of the life-threatening MRSA infection; suspicion about its origin falls on Nurse Julie Fitzjohn. There's gossip about Nick Jordan and Karen Newburn.
| Name | Type | Role |
|---|---|---|
| James Stevenson | Writer | |
| Garry Cooper | Guest Star | |
| Stuart Organ | Guest Star | |
| Simon Molloy | Guest Star | |
| Siobhan Burke | Guest Star | |
| Claire Goose | Guest Star | |
| Karen Ford | Guest Star | |
| Luke Mably | Guest Star | |
| Joanna Kirkland | Guest Star | |
| Keeley Forsyth | Guest Star | |
| Bryan Murray | Guest Star | |
| Robert Hamilton | Guest Star | |
| Marshall Lancaster | Guest Star | |
| Anny Tobin | Guest Star | |
| Victoria Gould | Guest Star | |
| Judi Lamb | Guest Star | |
| Eamon Boland | Guest Star | |
| Nigel Douglas | Director |