The Cybermen are released from their silos and are on the march, attacking Briggs's crew and ensuring that the freighter remains on course for Earth. But why?
| Name | Type | Role | |
|---|---|---|---|
| Eric Saward | Writer | ||
| Beryl Reid | Guest Star | ||
| Alec Sabin | Guest Star | ||
| David Banks | Guest Star | ||
| Clare Clifford | Guest Star | ||
| James Warwick | Guest Star | ||
| June Bland | Guest Star | ||
| Mark Hardy | Guest Star | ||
| Peter Grimwade | Director |