In Copenhagen, the travellers investigate the time-manipulating organisation called the Causeway.
| Name | Type | Role | |
|---|---|---|---|
| Richard Hope | Guest Star | Mr Barabbas | |
| Andrew Wincott | Guest Star | Peter Mansfield | |
| Poppy Miller | Guest Star | Professor Veronica Hays | |
| Henrietta Wolfmountain | Guest Star | Annika |