The crew encounter the System, builders and original owners of the Liberator (known to them as Deep Space Vehicle-2). They disable its defense systems in an attempt to try to get their craft back. A sister ship (DSV-1), in pursuit, is destroyed by Orac.
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Roy Evans | Guest Star | ||
| Sheila Ruskin | Guest Star | ||
| Harriet Philpin | Guest Star | ||
| Vere Lorrimer | Director |